comp.lang.c - 25 new messages in 10 topics - digest
comp.lang.c
http://groups.google.com/group/comp.lang.c?hl=en
Today's topics:
* Ask for book for efficient coding in C - 5 messages, 4 authors
http://groups.google.com/group/comp.lang.c/t/1b697accaac68aeb?hl=en
* Experiment: functional concepts in C - 3 messages, 2 authors
http://groups.google.com/group/comp.lang.c/t/7889fc59043eb32b?hl=en
* Array dependencies in c? - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/8f513c37ce316dd4?hl=en
* Avoid accessing an array to speed up the code? - 3 messages, 3 authors
http://groups.google.com/group/comp.lang.c/t/59e3471b01ada84a?hl=en
* automated test for sub-string search algorithms... - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/38aee559668ee60c?hl=en
* Get Mallika Sherawath Bathing Videos in all Angles - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/2221a96f3d4b748c?hl=en
* substring finding problem! - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/cf9bd97208e0c3a3?hl=en
* instructor's solutions manual for Trigonometry - A Unit Circle Approach, 8E,
Michael Sullivan - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/8ee0dbe38a44c90a?hl=en
* no investment earn part time - 2 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/e9016b1480907351?hl=en
* Efficency and the standard library - 7 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/ad9fea19f2f7dd61?hl=en
==============================================================================
TOPIC: Ask for book for efficient coding in C
http://groups.google.com/group/comp.lang.c/t/1b697accaac68aeb?hl=en
==============================================================================
== 1 of 5 ==
Date: Sat, Feb 20 2010 3:02 pm
From: MBALOVER
Hi all,
Do you know what book that discusses what we should and should not do
in C programming? It is not a book teaching about syntax, etc. but a
book teaches us the experience to optimize our code.
For example, I read somewhere that we should avoid function calls to
make the program run fast. Calling (and returning from) a function is
time-consuming, and not because the content of the function takes time
to execute — just getting into the function, and back out of it, uses
processor time.
I want to find some experiences like this.
Do you know any book discussing this?
Thank you.
== 2 of 5 ==
Date: Sat, Feb 20 2010 3:07 pm
From: Richard Heathfield
MBALOVER wrote:
> Hi all,
>
> Do you know what book that discusses what we should and should not do
> in C programming? It is not a book teaching about syntax, etc. but a
> book teaches us the experience to optimize our code.
>
> For example, I read somewhere that we should avoid function calls to
> make the program run fast. Calling (and returning from) a function is
> time-consuming, and not because the content of the function takes time
> to execute � just getting into the function, and back out of it, uses
> processor time.
>
> I want to find some experiences like this.
>
> Do you know any book discussing this?
I do, but I'm not going to tell you what it is - for two reasons.
Firstly, because the book I have in mind discusses lots of other things
as well; it's not dedicated solely to the subject of optimisation. And
the second reason is that you can get most or maybe all of what it has
to say, from the Web:
http://leto.net/docs/C-optimization.php
Not sure if that's the owner's link, but it looks good.
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
"Usenet is a strange place" - dmr 29 July 1999
Sig line vacant - apply within
== 3 of 5 ==
Date: Sat, Feb 20 2010 3:47 pm
From: MBALOVER
Thanks Richard,
I am reading the web site and it is really helpful.
Thanks a lot.
On Feb 20, 6:07 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
> MBALOVER wrote:
> > Hi all,
>
> > Do you know what book that discusses what we should and should not do
> > in C programming? It is not a book teaching about syntax, etc. but a
> > book teaches us the experience to optimize our code.
>
> > For example, I read somewhere that we should avoid function calls to
> > make the program run fast. Calling (and returning from) a function is
> > time-consuming, and not because the content of the function takes time
> > to execute just getting into the function, and back out of it, uses
> > processor time.
>
> > I want to find some experiences like this.
>
> > Do you know any book discussing this?
>
> I do, but I'm not going to tell you what it is - for two reasons.
> Firstly, because the book I have in mind discusses lots of other things
> as well; it's not dedicated solely to the subject of optimisation. And
> the second reason is that you can get most or maybe all of what it has
> to say, from the Web:
>
> http://leto.net/docs/C-optimization.php
>
> Not sure if that's the owner's link, but it looks good.
>
> --
> Richard Heathfield <http://www.cpax.org.uk>
> Email: -http://www. +rjh@
> "Usenet is a strange place" - dmr 29 July 1999
> Sig line vacant - apply within
== 4 of 5 ==
Date: Sat, Feb 20 2010 8:53 pm
From: Hamiral
Richard Heathfield wrote:
> http://leto.net/docs/C-optimization.php
>
> Not sure if that's the owner's link, but it looks good.
>
To answer to the OP :
"Part of the clarity is making hunks of code into functions when
appropriate. The cost of a function call is extremely small on modern
machines, so optimization is NOT a valid excuse for writing ten-page
functions."
This is an extract from the website you gave, and every programmmer (any
language) should stick to that.
Ham
== 5 of 5 ==
Date: Sat, Feb 20 2010 9:00 pm
From: Anand Hariharan
On Feb 20, 5:47 pm, MBALOVER <mbalov...@gmail.com> wrote:
> Thanks Richard,
>
> I am reading the web site and it is really helpful.
>
> Thanks a lot.
>
> On Feb 20, 6:07 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
>
>
>
> > MBALOVER wrote:
> >
Please read up on usenet etiquette; in particular, please do not top-
post, quote signatures.
> > > For example, I read somewhere that we should avoid function calls to
> > > make the program run fast. Calling (and returning from) a function is
> > > time-consuming, and not because the content of the function takes time
> > > to execute just getting into the function, and back out of it, uses
> > > processor time.
>
Depending upon what "avoid function calls" means, that is very bad
advice (results in spaghetti code) or if it is taken to mean inlining
(implementations provide them as optimisation options), may or may not
lead to faster programs:
http://www.parashift.com/c++-faq-lite/inline-functions.html#faq-9.3
(Note that the link is about a C++ keyword, but the specific answer is
meaningful for C as well.)
- Anand
==============================================================================
TOPIC: Experiment: functional concepts in C
http://groups.google.com/group/comp.lang.c/t/7889fc59043eb32b?hl=en
==============================================================================
== 1 of 3 ==
Date: Sat, Feb 20 2010 3:07 pm
From: ike@localhost.claranet.nl (Ike Naar)
In article <hlpmek$so9$1@speranza.aioe.org>,
jacob navia <jn@nospam.org> wrote:
>Ike Naar a �crit :
>> In article <hlpl8l$r8u$1@speranza.aioe.org>,
>> jacob navia <jn@nospam.org> wrote:
>>> We are speaking all the time about unneeded CALLS TO MALLOC before the
>>> program exits. I repeated that you shuld use THAT context only.
>>
>> So you use "CALLS TO MALLOC" to clean up memory?
>
>fine
>very clever
Thanks ;-)
>I thought free and wrote malloc. It is obvious what I wanted to say isn't it?
Yes, it was obvious.
I wouldn't have commented on it if you hadn't been shouting.
== 2 of 3 ==
Date: Sat, Feb 20 2010 5:04 pm
From: Kaz Kylheku
On 2010-02-20, Ike Naar <ike@localhost.claranet.nl> wrote:
> In article <hlpl8l$r8u$1@speranza.aioe.org>,
> jacob navia <jn@nospam.org> wrote:
>>We are speaking all the time about unneeded CALLS TO MALLOC before the
>>program exits. I repeated that you shuld use THAT context only.
>
> So you use "CALLS TO MALLOC" to clean up memory?
By malloc, Jacob probably means the allocation facility.
Do you also think that calls to Washigton are to the city itself?
== 3 of 3 ==
Date: Sat, Feb 20 2010 5:09 pm
From: ike@localhost.claranet.nl (Ike Naar)
In article <20100220170327.449@gmail.com>,
Kaz Kylheku <kkylheku@gmail.com> wrote:
>On 2010-02-20, Ike Naar <ike@localhost.claranet.nl> wrote:
>> In article <hlpl8l$r8u$1@speranza.aioe.org>,
>> jacob navia <jn@nospam.org> wrote:
>>>We are speaking all the time about unneeded CALLS TO MALLOC before the
>>>program exits. I repeated that you shuld use THAT context only.
>>
>> So you use "CALLS TO MALLOC" to clean up memory?
>
>By malloc, Jacob probably means the allocation facility.
No, he meant "free" (see elsethread)
>Do you also think that calls to Washigton are to the city itself?
Of course.
==============================================================================
TOPIC: Array dependencies in c?
http://groups.google.com/group/comp.lang.c/t/8f513c37ce316dd4?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 20 2010 3:54 pm
From: lacos@ludens.elte.hu (Ersek, Laszlo)
In article <2010021916343116807-rcktman77@gmailcom>, rcktman77 <rcktman77@gmail.com> writes:
> I have a problem which I'm trying to solve with c, and I'm wondering if
> anyone might be able to provide me with some detailed help on how this
> is accomplished in c.
>
> Problem Details:
>
> I have a computational surface mesh around an arbitrary geometry. I
> have 3 files containing details of the nodes, cells, and integrated
> forces at each cell. The first file contains a node identifier (just a
> random number) and the x-, y-, & z- cartesian coordinates of that
> particular node for all the nodes in the computational mesh. The
> second file contains a surface element identifier (again just a number)
> along with the 4 node identifiers from the first file which correspond
> to the corners of the quadrilateral cell element for all the cell
> elements in the mesh. Finally, the third file contains the surface
> element identifier from the second file along with integrated x-, y-,
> and z- forces for each one of these elements. By summing all of the
> surface forces in a particular direction I would get the corresponding
> directed force over the entire arbitrary geometry.
>
> Once I read the data from the three files and save it into three
> separate arrays, I would like to be able to sum all of the forces in a
> particular cartesian direction based upon it's x-, y-, or z- extent.
> Thus the force data from the third file has a dependency on the node
> x-, y-, and z- coordinates in the first file. How do I relate these
> arrays to each other in order to accomplish this within c?
>
> Any help would be appreciated...
I have written a program for you. It shouldn't be hard to adapt to your
needs.
I also tried to put my money where my mouth is, and employ those
infamous cleanup routines.
The program shouldn't leak memory or crash in any case, or accept any
invalid input. Please try to break it, if you care. I don't have much
floating point experience (error accumulation etc), so those parts may
be a bit less stable. (I do hope that other parts are correct.)
Thanks,
lacos
/*
This program reads three text files with the following line formats:
nodes: <node-id> <x> <y> <z>
Defines a vertex in 3D space. The coordinates are doubles, the <node-id> is
a non-negative long. The program runs in the C (POSIX) locale. No trailing
whitespace is allowed.
elements: <element-id> <v1> <v2> <v3>
Defines a triangle. All tokens are parsed as non-negative longs. The last
three tokens are vertex identifiers, referring to nodes (vertices) defined
in the previous file. No trailing whitespace is allowed.
lights: <element-id> <x> <y> <z>
Similar in format to the nodes file. Such an entry updates the light vector
for a triangle (surface element) defined in the elements file. Each
triangle must have a light vector, or an error is reported. If multiple
light vectors are given for a triangle, the last one will prevail.
The program computes the amounts (magnitudes) of light absorbed by individual
cells, and prints their sum to stdout. If the compute() function is removed
or replaced (which contains static assertions for the values of NDIM and NVX,
see below), then the number of components in a vector and the number of
vertices in a surface cell can be redefined. This should have a correct
effect on the line formats described above.
Not considering the current malloc() / free() wrappers, and error messages
written to stderr, the program can be considered a module with sharp
boundaries. Currently, said wrappers write a malloc() / free() trace to
stderr.
I hereby place this program, "glow.c", in the public domain. (Don't laugh!)
21-Feb-2010 Laszlo Ersek <lacos@caesar.elte.hu>
The lacos_rbtree module is available under the GPL, but it should be easy to
replace. For testing, download lbzip2.tar.gz from http://lacos.hu/, and pick
lacos_rbtree.[ch] from it. The tarball also contains a perl script named
malloc_trace.pl, which can be used to check the allocation trace output by
the wrappers mentioned above.
Compiling with gcc on GNU/Linux:
$ gcc -ansi -pedantic -g3 -O2 -Wall -Wextra -o glow glow.c lacos_rbtree.c -lm
Running:
$ ./glow nodes.txt elements.txt lights.txt 2>trace-and-errors.txt
*/
#define _XOPEN_SOURCE 500 /* SUSv2 */
#include <string.h> /* strrchr() */
#include <stdio.h> /* fprintf() */
#include <stdlib.h> /* EXIT_FAILURE */
#include <errno.h> /* errno */
#include <limits.h> /* LONG_MAX */
#include <math.h> /* HUGE_VAL */
#include <float.h> /* DBL_DIG */
#include <sys/types.h> /* getpid() */
#include <unistd.h> /* getpid() */
#include "lacos_rbtree.h" /* struct lacos_rbtree_node */
/* Size of buffer used for transferring lines from files. */
#define LNSIZ ((size_t)1024)
/* Number of components in a vector. */
#define NDIM ((size_t)3)
/* Number of vertices in a mesh cell (surface element). */
#define NVX ((size_t)3)
/* Basename of the binary. */
static const char *pname;
/*
USAGE:
Build or update a context from objects parsed line-wise from a file.
PARAMETERS:
ctx:
The context to build or update.
proc:
Pointer to function that will modify the context, according to the
line passed to it. Must return 0 if the update was successful and -1 if
not.
teardown:
If not a null pointer, then a pointer to a function that undoes the
modifications to the context up to this point, or destroys the context
completely. Will be called if (*proc)() returns -1, or in case of an IO
error.
fname:
Pathname of the file to parse.
RETURN VALUE:
0
if successful (EOF reached without any error),
-1
otherwise. (*teardown)(ctx) will be called before returning, if teardown
is not a null pointer.
*/
static int
parse(
void *ctx,
int (*proc)(
void *ctx,
const char *line,
const char *fname,
long unsigned lno
),
void (*teardown)(
void *ctx
),
const char *fname
)
{
int ret; /* -1: failure, 0: finished, 1: continue */
FILE *f;
ret = -1;
f = fopen(fname, "r");
if (0 == f) {
(void)fprintf(stderr, "%s: fopen(\"%s\", \"r\"): %s\n", pname, fname,
strerror(errno));
}
else {
long unsigned lno;
ret = 1;
lno = 1LU;
do {
char buf[LNSIZ];
if (0 == fgets(buf, sizeof buf, f)) {
if (ferror(f)) {
(void)fprintf(stderr, "%s: \"%s\":%lu: fgets(): %s\n", pname, fname,
lno, strerror(errno));
ret = -1;
}
else {
ret = 0; /* EOF */
}
}
else {
{
size_t len;
len = strlen(buf);
if (len > 0u && '\n' == buf[len - 1u]) {
buf[len - 1u] = '\0';
}
}
if (-1 == (*proc)(ctx, buf, fname, lno)) {
ret = -1;
}
else {
++lno;
}
} /* line read */
} while (1 == ret);
if (EOF == fclose(f) && 0 == ret) {
(void)fprintf(stderr, "%s: fclose(\"%s\"): %s\n", pname, fname,
strerror(errno));
ret = -1;
}
} /* open successful */
if (-1 == ret && 0 != teardown) {
(*teardown)(ctx);
}
return ret;
}
struct hdr
{
long id; /* object id */
long unsigned lno; /* parsed on line number */
};
/*
Parser context for building a red-black tree from objects parsed from a file.
*/
struct rbt_build
{
/* The tree to build. */
struct lacos_rbtree_node **root;
/*
Pointer to function parsing a new element from a line of the file. The
first member of the constructed element must be an initialized instance of
"struct hdr". This function must return the address of the newly
constructed object on success, and 0 otherwise. Any returned object must be
destructible by a single dealloc() call. The aux tree is a hierarchy of
auxiliary objects, utilized during construction.
*/
struct hdr *(*construct)(
const char *line,
struct lacos_rbtree_node *aux,
long unsigned lno
);
/* Root of tree of auxiliary objects passed to (*construct)(). */
struct lacos_rbtree_node *aux;
};
/* The usual comparator for pointed-to longs. */
static int
cmp_long(const void *v1, const void *v2)
{
long id1,
id2;
id1 = *(const long *)v1;
id2 = *(const long *)v2;
return
id1 < id2 ? -1
: id1 > id2 ? 1
: 0;
}
/* Wrapper function around malloc(). */
static void *
alloc(size_t size, void *ignored)
{
void *ptr;
ptr = malloc(size);
if (0 > fprintf(stderr, "%lu: malloc(%lu) == %p\n",
(long unsigned)getpid(), (long unsigned)size, ptr)) {
abort();
}
return ptr;
}
/* Wrapper function around free(). */
static void
dealloc(void *ptr, void *ignored)
{
if (0 > fprintf(stderr, "%lu: free(%p)\n", (long unsigned)getpid(), ptr)) {
abort();
}
free(ptr);
}
/* Parser callback for constructing an object and adding it to the tree. */
static int
rbt_build_proc(void *v_rbt_build, const char *line, const char *fname,
long unsigned lno)
{
struct rbt_build *rbt_build;
struct hdr *obj;
rbt_build = v_rbt_build;
obj = (*rbt_build->construct)(line, rbt_build->aux, lno);
if (0 == obj) {
(void)fprintf(stderr, "%s: \"%s\":%lu: object construction failed\n",
pname, fname, lno);
}
else {
struct lacos_rbtree_node *new_node;
if (-1 != lacos_rbtree_insert(
/* new_root */ rbt_build->root,
/* new_node */ &new_node,
/* new_data */ obj,
/* cmp */ &cmp_long,
/* alloc */ &alloc,
/* alloc_ctl */ 0)
) {
return 0;
}
if (0 == new_node) {
(void)fprintf(stderr, "%s: \"%s\":%lu: out of memory\n", pname, fname,
lno);
}
else {
struct hdr *coll;
coll = *(void **)new_node;
(void)fprintf(stderr, "%s: \"%s\":%lu:%lu: object id collision: %ld\n",
pname, fname, coll->lno, lno, coll->id);
}
dealloc(obj, 0);
} /* object construction successful */
return -1;
}
/* Destroys a tree and frees all linked-to objects. */
static void
destroy(struct lacos_rbtree_node **root)
{
while (0 != *root) {
void *obj;
lacos_rbtree_delete(
/* new_root */ root,
/* old_node */ *root,
/* old_data */ &obj,
/* dealoc */ &dealloc,
/* alloc_ctl */ 0
);
dealloc(obj, 0);
}
}
static void
rbt_teardown(void *v_rbt_build)
{
destroy(((struct rbt_build *)v_rbt_build)->root);
}
/* Very thin wrapper around strtol(). Internals are meant to be exposed. */
static long
prs_long(const char *str, char **endptr)
{
long tmp;
errno = 0;
tmp = strtol(str, endptr, 0);
return
(0L < tmp && tmp < LONG_MAX)
|| (0L == tmp && *endptr != str)
|| (LONG_MAX == tmp && 0 == errno) ? tmp : -1L;
}
/*
Parse a (coord[0], ..., coord[NDIM-1]) tuple from a string. Return 0 if
successful, -1 if failed.
*/
static int
prs_coord(double coord[NDIM], const char *str, char **endptr)
{
const char *scan;
size_t didx;
scan = str;
didx = 0u;
errno = 0;
do {
double dtmp;
dtmp = strtod(scan, endptr);
if (
((HUGE_VAL == dtmp || -HUGE_VAL == dtmp) && 0 != errno)
|| (0.0 == dtmp && (*endptr == scan || 0 != errno))
) {
return -1;
}
coord[didx] = dtmp;
scan = *endptr;
} while (++didx < NDIM);
return 0;
}
struct vertex
{
struct hdr hdr;
double coord[NDIM];
};
/* Parse a vertex object from a string. */
static struct hdr *
prs_vertex(const char *line, struct lacos_rbtree_node *ignored,
long unsigned lno)
{
struct vertex *vx;
vx = alloc(sizeof *vx, 0);
if (0 != vx) {
char *scan;
vx->hdr.id = prs_long(line, &scan);
if (-1L != vx->hdr.id && -1 != prs_coord(vx->coord, scan, &scan)
&& '\0' == *scan) {
vx->hdr.lno = lno;
return (struct hdr *)vx;
}
dealloc(vx, 0);
}
return 0;
}
struct cell
{
struct hdr hdr;
struct vertex *vertex[NVX]; /* only for navigation */
double light[NDIM]; /* comps. of the light vec, filled in later */
int light_init; /* light vector initialized */
};
/* Parse a cell object from a string, leave light vec uninitialized. */
static struct hdr *
prs_cell(const char *line, struct lacos_rbtree_node *vertices,
long unsigned lno)
{
struct cell *cell;
cell = alloc(sizeof *cell, 0);
if (0 != cell) {
char *scan;
cell->hdr.id = prs_long(line, &scan);
if (-1L != cell->hdr.id) {
size_t vidx;
for (vidx = 0u; vidx < NVX; ++vidx) {
long key;
key = prs_long(scan, &scan);
if (-1L != key) {
struct lacos_rbtree_node *vx_node;
vx_node = lacos_rbtree_find(vertices, &key, &cmp_long);
if (0 != vx_node) {
cell->vertex[vidx] = *(void **)vx_node;
continue;
}
}
break;
}
if (NVX == vidx && '\0' == *scan) {
cell->hdr.lno = lno;
cell->light_init = 0;
return (struct hdr *)cell;
}
}
dealloc(cell, 0);
}
return 0;
}
/* Parser callback for finding a cell and modifying its light vector. */
static int
cell_light_proc(void *v_cells, const char *line, const char *fname,
long unsigned lno)
{
long key;
char *scan;
key = prs_long(line, &scan);
if (-1L == key) {
(void)fprintf(stderr, "%s: \"%s\":%lu: unable to parse object id\n", pname,
fname, lno);
}
else {
struct lacos_rbtree_node *cell_node;
cell_node = lacos_rbtree_find(v_cells, &key, &cmp_long);
if (0 == cell_node) {
(void)fprintf(stderr, "%s: \"%s\":%lu: object id not found: %ld\n",
pname, fname, lno, key);
}
else {
struct cell *cell;
cell = *(void **)cell_node;
if (-1 == prs_coord(cell->light, scan, &scan) || '\0' != *scan) {
(void)fprintf(stderr, "%s: \"%s\":%lu: unable to parse coordinates\n",
pname, fname, lno);
}
else {
cell->light_init = 1;
return 0;
}
}
}
return -1;
}
/*
Compute the total amount of light absorbed by all cells. Return 0 if
successful, and -1 if at least one cell has an uninitialized light vector.
*/
static int
compute(double *sum, struct lacos_rbtree_node *cells)
{
typedef int triangle_mesh[3u == NVX ? 1 : -1];
typedef int space_3d[3u == NDIM ? 1 : -1];
struct lacos_rbtree_node *cell_node;
*sum = 0.0;
for (
cell_node = lacos_rbtree_min(cells);
0 != cell_node;
cell_node = lacos_rbtree_next(cell_node)
) {
struct cell *cell;
double edge1[NDIM], edge2[NDIM];
size_t didx;
cell = *(void **)cell_node;
if (0 == cell->light_init) {
(void)fprintf(stderr, "%s: light vector of cell %ld was not"
" initialized\n", pname, cell->hdr.id);
return -1;
}
for (didx = 0u; didx < NDIM; ++didx) {
edge1[didx]
= cell->vertex[1]->coord[didx] - cell->vertex[0]->coord[didx];
edge2[didx]
= cell->vertex[2]->coord[didx] - cell->vertex[0]->coord[didx];
}
/*
Compute the scalar triple product "light * (edge1 x edge2)". This will
yield, not considering sign, twice the amount of the light absorbed by
this triangle cell.
+-- --+
| |
| light[0] light[1] light[2] |
absorption = | det | edge1[0] edge1[1] edge1[2] | | / 2
| edge2[0] edge2[1] edge2[2] |
| |
+-- --+
*/
*sum += fabs(
cell->light[0] * edge1[1] * edge2[2]
- cell->light[0] * edge1[2] * edge2[1]
+ cell->light[1] * edge1[2] * edge2[0]
- cell->light[1] * edge1[0] * edge2[2]
+ cell->light[2] * edge1[0] * edge2[1]
- cell->light[2] * edge1[1] * edge2[0]) / 2.0;
}
return 0;
}
int
main(int argc, char **argv)
{
int ret;
ret = EXIT_FAILURE;
pname = strrchr(argv[0], '/');
pname = pname ? pname + 1 : argv[0];
if (4 != argc) {
(void)fprintf(stderr, "%1$s: usage: %1$s NODES ELEMENTS LIGHTS\n", pname);
}
else {
struct lacos_rbtree_node *vertices;
struct rbt_build bld;
vertices = 0;
bld.root = &vertices;
bld.construct = &prs_vertex;
bld.aux = 0;
if (-1 != parse(&bld, &rbt_build_proc, &rbt_teardown, argv[1])) {
struct lacos_rbtree_node *cells;
cells = 0;
bld.root = &cells;
bld.construct = &prs_cell;
bld.aux = vertices;
if (-1 != parse(&bld, &rbt_build_proc, &rbt_teardown, argv[2])) {
if (-1 != parse(cells, &cell_light_proc, 0, argv[3])) {
double sum;
if (-1 != compute(&sum, cells)) {
(void)fprintf(stdout, "%.*g\n", (int)DBL_DIG, sum);
if (EOF == fflush(stdout)) {
(void)fprintf(stderr, "%s: fflush(stdout): %s\n", pname,
strerror(errno));
}
else {
ret = EXIT_SUCCESS;
}
}
}
destroy(&cells);
}
destroy(&vertices);
}
}
return ret;
}
==============================================================================
TOPIC: Avoid accessing an array to speed up the code?
http://groups.google.com/group/comp.lang.c/t/59e3471b01ada84a?hl=en
==============================================================================
== 1 of 3 ==
Date: Sat, Feb 20 2010 4:06 pm
From: Barry Schwarz
On Sat, 20 Feb 2010 14:55:48 -0800 (PST), MBALOVER
<mbalover9@gmail.com> wrote:
>Hi all,
>
>My objective is to make my program written in C as fast as I can.
>
>I read somewhere that I should avoid accessing an array too much
>because it takes processor's time. Is that true?
>
>For example, is Version 2 faster than Version 1?
>
>Version 1:
>
>int A[10];
>A[5]=10;
>
>for (i=0;i<1000;++i)
>{
> if (A[5]>8)
> printf("helllo");
>}
>
>
>Version 2:
>
>int A[10];
>A[5]=10;
>B=A[5]; //<== Now I use variable B instead of the A[5]
>
>for (i=0;i<1000;++i)
>{
> if B>8
> printf("hello");
>}
If the subscript is a constant, probably not. While not required to,
most compilers will perform the address calculations at compile time
and execution time to access the array element would be the same as
for a non-array object of the same type.
For a variable subscript, it depends on several factors including how
well the compiler recognizes repeated references with an unchanged
subscript, how often you reference the object, whether the sizeof the
object is a power of 2, etc.
This is more a quality of implementation issue rather than a language
issue.
--
Remove del for email
== 2 of 3 ==
Date: Sat, Feb 20 2010 4:36 pm
From: jt@toerring.de (Jens Thoms Toerring)
MBALOVER <mbalover9@gmail.com> wrote:
> My objective is to make my program written in C as fast as I can.
> I read somewhere that I should avoid accessing an array too much
> because it takes processor's time. Is that true?
> For example, is Version 2 faster than Version 1?
> Version 1:
> int A[10];
> A[5]=10;
> for (i=0;i<1000;++i)
> {
> if (A[5]>8)
> printf("helllo");
> }
> Version 2:
> int A[10];
> A[5]=10;
> B=A[5]; //<== Now I use variable B instead of the A[5]
> for (i=0;i<1000;++i)
> {
> if B>8
> printf("hello");
> }
There's no way to say for sure. You have two things: there's the
C language and then you have a compiler that converts a program
written in C into machine code (not to go into too much detail).
The C language doesn't state "doing something this way will be
faster than doing it some other way." How fast things are going
to be depends on how the the compiler converts the C program into
machine code.
There's a good chance that the compiler will notice that you
use A[5] over and over again in a tight loop in version 1, so
it may just emit code for you version 1 that is roughly equiva-
lent to that for your version 2 (with the value of A[5] stored
in a CPU register).
But if you look at the two versions of the program (disregarding
syntax errors;-) you immediately will see that there's an even
"faster" version
int A[ 10 ];
A[ 5 ] = 10;
if ( A[ 5 ] > 8 )
{
for ( i = 0; i < 1000; ++i )
printf( "hello" );
}
since with this version you don't do all the (redundant) checks
within the loop over and over again. The compiler may be able
to notice this and output machine code that is equivlent to code
generated from version 3, even for version 1 and 2 of your pro-
gram.
But the compiler may even notice that A[5] is always larger than
8, so the machine code you may end up with could very well be
just the equivaled of
int A[ 10 ];
A[ 5 ] = 10;
for ( i = 0; i < 1000; ++i )
printf( "hello" );
or even
int A[ 10 ];
A[ 5 ] = 10;
print( "hellohellohellohello/ repeat 995 times /hello");
So, you can't say "If I write something this way it will be
faster." The C language hasn't any built-in guarantees for
any of this. If something is faster or slower depends on how
good the compiler you use is at optimizing the C code you
pass to it for the machine it's going to be run on.
Getting compilers to create faster machine code is an on-going
effort. Compilers have gotten quite good at that and the usual
recommendation nowadays thus seems to be to write code that's
easy to understand and let the compiler take care of optimiza-
tions (writing too convoluted code may even throw off the com-
piler and result in slower execution). Only if there's a bottle-
neck you found by actually measuring how much time is spend at
certain parts of your program it makes sense to worry about re-
arranging the C code in order to help the compiler to emit
faster machine code (and then this will probably only work
with the compiler you did the measurements with and on that
architecture, using a different compiler or architecture the
same "improvements" may end up being contraproductive).
There's a lot of folklore to be found about "this will result
in faster code" but be wary of such claims - they may have been
correct 20 years ago when compilers weren't as good as they are
today. If you really need utmost speed (with a certain compiler
on a certain architecture) the only thing you should trust is
careful measurements and not believe in some "I read somewhere
that this is faster than that." statements.
If you are interested what happens mainly out of curiosity then
having a look at the assembler code generated by the compiler
might be enlightening. But just don't assume that the results
you get from one compiler will be the same as that fron another
one.
Regards, Jens
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de
== 3 of 3 ==
Date: Sat, Feb 20 2010 4:52 pm
From: Phil Carmody
jt@toerring.de (Jens Thoms Toerring) writes:
[SNIP - informative post]
> If you are interested what happens mainly out of curiosity then
> having a look at the assembler code generated by the compiler
> might be enlightening. But just don't assume that the results
> you get from one compiler will be the same as that from another
> one.
However, as an aside, GCC's often had as its objective the mimicking
of a chip vendor's own optimising compiler.
Phil
--
Any true emperor never needs to wear clothes. -- Devany on r.a.s.f1
==============================================================================
TOPIC: automated test for sub-string search algorithms...
http://groups.google.com/group/comp.lang.c/t/38aee559668ee60c?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 20 2010 5:11 pm
From: "Chris M. Thomasson"
"Chris M. Thomasson" <no@spam.invalid> wrote in message
news:BaZfn.2632$BD2.598@newsfe14.iad...
> This code includes my sub-string search algorithm, the automated test, and
> a stress test for my algorithm:
>
>
> http://clc.pastebin.com/f5cb3bbd2
[...]
There is a little bug on `line 68':
printf("source(%u): %s\n",
(unsigned long)src_size,
src);
The first formatter is not compatible with the damn argument! Here, let me
fix that:
http://clc.pastebin.com/f32655568
Sorry about that crap. Anyway, I changed a couple of things. One, I funnel
all debug messages through a function macro `DBG_PRINTF()' which
automatically disables output if `NDEBUG' is defined. Two, I made a little
tweak to the search algorithm itself. It now searches from left-to-right
after it determines that a rightmost character matches the rightmost
character from the comparand.
IMHO, this simple little test program comes in handy when you are trying to
debug a sub-string search algorithm. I can play around with all sorts of
improvements and see exactly where each one of them fail. One thing I am
exploring is reading 32/64-bits worth of characters at a time. This allows
me reduce the total number of comparisons...
==============================================================================
TOPIC: Get Mallika Sherawath Bathing Videos in all Angles
http://groups.google.com/group/comp.lang.c/t/2221a96f3d4b748c?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 20 2010 5:37 pm
From: MY NAME IS MY NAME
Get Mallika Sherawath Bathing Videos At
http://blogcreationandhosting.blogspot.com/2009/11/1-per-click-in-adsense-programs.html
< Due to some issues,I have hidden these videos inside an image.In
that website , click on the big vertical Image on right side of
website & get the videos, Enjoy it >
==============================================================================
TOPIC: substring finding problem!
http://groups.google.com/group/comp.lang.c/t/cf9bd97208e0c3a3?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 20 2010 5:42 pm
From: Ben Bacarisse
cri@tiac.net (Richard Harter) writes:
> On 20 Feb 2010 16:36:47 GMT, blmblm@myrealbox.com
> <blmblm@myrealbox.com> wrote:
>
>>In article <7u82l6Fvb9U1@mid.individual.net>,
>>blmblm@myrealbox.com <blmblm@myrealbox.com> wrote:
>>> In article <4b7eb795.340407953@text.giganews.com>,
>>> Richard Harter <cri@tiac.net> wrote:
>
> [snip]
>>
>>> Yes, I saw your code, though I really only looked at the main
>>> program and the comments -- both of which I rather like better
>>> than mine.
>>>
>>> I think I was rather hoping that the others who had posted
>>> solutions might use my code to benchmark, but really, how hard
>>> would it be for *me* to do that .... Maybe I will. "Stay tuned"?
>>
>>For what it's worth, I pulled the replace() function and supporting
>>code out of your solution and connected it with my benchmarking
>>driver. Output below, followed by output of the best-performing
>>of my solutions. Yours is faster, though not spectacularly so.
>>I'll probably do similar experiments with others' solutions as
>>time and interest permit ....
>>
>>======== OUTPUT with your replace() ========
>>
>>Richard Harter's version
> [snip]
>>16 tests (counting repeats)
>>0 errors (counting repeats)
>>total time = 6.59 seconds
>>
>>======== OUTPUT with my replace() ========
>>
>>further improved version of replace():
>>scans input only once, building linked list of matches
>>avoids recomputing string lengths
>>uses user-written string functions
>
> [snip]
>
>>16 tests (counting repeats)
>>0 errors (counting repeats)
>>total time = 9.96 seconds
>
> Interesting. I suspect that mine is a bit faster because it
> doesn't need to construct linked lists - everything is on the
> stack. Also the calling recurse replaces calling malloc. That
> said, my version could be time optimized by eliminating
> recursion. The plan would be to create a default table holding a
> number of entries as an automatic variable, have a pointer to the
> table, and switch to a malloc based expansible table when the
> original one overflows. Instead of having m recursions the cost
> would O(log m) malloc calls. Equally important the actual loop
> can be compressed into a tight loop. If you want a hot version
> for reference I'll code it.
That's one of my versions, too. Up to now I have not posted any
timings because the relative speeds depend so much on the input used.
For example, with the 4K long test strings used by B L Massingill it
is hard to beat using strstr:
$ ./timer d4004 '[]' 'xx' bb_replace rh_replace fast_replace array_replace
bb_replace(`cat d4004`, "[]", "xx"):
2483200 calls in 3.998s is 1.61µs/call (1.61e-06s/call)
rh_replace(`cat d4004`, "[]", "xx"):
424600 calls in 4.001s is 9.422µs/call (9.422e-06s/call)
fast_replace(`cat d4004`, "[]", "xx"):
1123600 calls in 3.999s is 3.559µs/call (3.559e-06s/call)
array_replace(`cat d4004`, "[]", "xx"):
3519700 calls in 4.000s is 1.136µs/call (1.136e-06s/call)
(d4004 is a file containing 4004 bytes with two '[]' sub-strings.)
bb_replace is the very simple code I posted a while ago. rh_replace
is yours. fast_replace uses a local array to store the match
locations and some hand-written sub-string code to avoid the
re-scanning implied by using strstr (I'll post it below) and
array_replace is the same, but simply uses strstr to find the
sub-strings.
If we use short strings, the position is reversed in that the two that
use strstr (bb_replace and array_replace) pay a price:
$ ./timer "abcdefg[]hijklmnop[]qrstuvwxyz" '[]' 'xx' bb_replace rh_replace fast_replace array_replace
bb_replace("abcdefg[]hijklmnop[]qrstuvwxyz", "[]", "xx"):
10141800 calls in 3.999s is 394.3ns/call (3.943e-07s/call)
rh_replace("abcdefg[]hijklmnop[]qrstuvwxyz", "[]", "xx"):
29636400 calls in 4.000s is 135ns/call (1.35e-07s/call)
fast_replace("abcdefg[]hijklmnop[]qrstuvwxyz", "[]", "xx"):
26954200 calls in 4.000s is 148.4ns/call (1.484e-07s/call)
array_replace("abcdefg[]hijklmnop[]qrstuvwxyz", "[]", "xx"):
16888500 calls in 4.000s is 236.8ns/call (2.368e-07s/call)
The order is changed again if there is no matching sub-string:
$ ./timer "abcdefghijklmnopqrstuvwxyz" '[]' 'xx' bb_replace rh_replace fast_replace array_replace
bb_replace("abcdefghijklmnopqrstuvwxyz", "[]", "xx"):
38832000 calls in 3.998s is 103ns/call (1.03e-07s/call)
rh_replace("abcdefghijklmnopqrstuvwxyz", "[]", "xx"):
33301000 calls in 4.000s is 120.1ns/call (1.201e-07s/call)
fast_replace("abcdefghijklmnopqrstuvwxyz", "[]", "xx"):
43300700 calls in 4.000s is 92.38ns/call (9.238e-08s/call)
array_replace("abcdefghijklmnopqrstuvwxyz", "[]", "xx"):
46132400 calls in 4.000s is 86.71ns/call (8.671e-08s/call)
Pretty much any implementation has fast and slow cases. I am not sure
if there is any useful information in all of the data I can generate
(which it why I have not posted any results so far).
Anyway, here is my (probably misnamed) "fast_replace":
#include <string.h>
#define STRLEN strlen
#define STRSTR strstr
#define STRCPY strcpy
#define STRNCMP strncmp
#define MEMCPY memcpy
#define FN(x) x
#define AUTO_SIZE 20
char *FN(fast_replace)(char *src, char *match, char *replacement)
{
size_t mlen = STRLEN(match), matches = 0, asize = AUTO_SIZE;
const char *small_list[AUTO_SIZE], **mp = small_list, **op = 0;
const char *anchor = src;
do {
while (*anchor && *anchor != *match)
++anchor;
if (*anchor) {
if (STRNCMP(anchor + 1, match + 1, mlen - 1) == 0) {
if (matches >= asize) {
const char **np = realloc(op, 2 * asize * sizeof *np);
if (!np) {
fprintf(stderr, "Out of memory\n");
free(op);
return 0;
}
if (!op)
MEMCPY(np, mp, sizeof small_list);
mp = op = np;
asize *= 2;
}
mp[matches++] = anchor;
anchor += mlen;
}
else ++anchor;
}
else break;
} while (*anchor);
size_t rlen = matches ? STRLEN(replacement) : 0;
char *result = malloc(anchor - src - matches*mlen + matches*rlen + 1);
if (result) {
char *dst = result;
const char *s = src;
for (int i = 0; i < matches; ++i) {
MEMCPY(dst, s, mp[i] - s);
MEMCPY(dst += mp[i] - s, replacement, rlen);
dst += rlen;
s = mp[i] + mlen;
}
STRCPY(dst, s);
}
free(op);
return result;
}
The macros are to enable me to build an alternate version that
uses naive home-grown versions of strlen, strstr etc to see
how that impacts on the performance.
Maybe you had something faster in mind. I'll happily add it to my
test set.
--
Ben.
==============================================================================
TOPIC: instructor's solutions manual for Trigonometry - A Unit Circle Approach,
8E, Michael Sullivan
http://groups.google.com/group/comp.lang.c/t/8ee0dbe38a44c90a?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 20 2010 9:10 pm
From: Mark Rain
I have the comprehensive instructor's solutions manuals in an
electronic format for the following textbooks. They include full
solutions to all the problems in the text, but please DO NOT POST
HERE, instead send me email including title and edition of the
solutions manual u need.
NOTE: This service is NOT free
My email: markrainsun( at )gmail( dot )com
Here are some from my list ...
solutions manual to A First Course in Differential Equations (7th
ed.) Zill & Diferential Equations (5th ed.)Zill & Cullen
solutions manual to A Course in Game Theory by Osborne, Rubinstein
solutions manual to A Course in Modern Mathematical Physics by Peter
Szekeres
solutions manual to A First Course in Abstract Algebra (7th Ed., John
B. Fraleigh)
solutions manual to A First Course in Differential Equations - The
Classic Fifth Edition By Zill, Dennis G
solutions manual to A First Course In Probability 7th Edition by
Sheldon M. Ross
solutions manual to A First Course in Probability Theory, 6th edition,
by S. Ross.
solutions manual to A First Course in String Theory, 2004, Barton
Zwiebach
solutions manual to A First Course in the Finite Element Method, 4th
Edition logan
solutions manual to A Practical Introduction to Data Structures and
Algorithm Analysis 2Ed by Shaffer
solutions manual to A Quantum Approach to Condensed Matter Physics
(Philip L. Taylor & Olle Heinonen)
solutions manual to A Short Course in General Relativity 2e by J.
Foster and J. D. Nightingale
solutions manual to A Short Introduction to Quantum Information and
Quantum Computation by Michel Le Bellac
solutions manual to Accounting Principles 8e by Kieso, Kimmel
solutions manual to Adaptive Control, 2nd. Ed., by Astrom, Wittenmark
solutions manual to Adaptive Filter Theory (4th Ed., Simon Haykin)
solutions manual to Advanced Accounting 10E international ED by
Beams , Clement, Anthony, Lowensohn
solutions manual to Advanced Calculus Gerald B. Folland
solutions manual to Advanced Digital Design with the Verilog HDL by
Michael D. Ciletti
solutions manual to Advanced Dynamics (Greenwood)
solutions manual to Advanced Engineering Electromagnetics by
Constantine A. Balanis
solutions manual to Advanced Engineering Mathematics 3rd ed zill
solutions manual to Advanced Engineering Mathematics 8Ed Erwin
Kreyszig
solutions manual to Advanced Engineering Mathematics by Erwin
Kreyszig, 9th ed
solutions manual to Advanced Engineering Mathematics, 6th Edition by
Peter V. O'Neil
solutions manual to Advanced Engineering Mathematics,2E, by Zill,
Cullen
solutions manual to Advanced Engineering Thermodynamics, 3rd Edition
by Adrian Bejan
solutions manual to Advanced Financial Accounting by Baker
solutions manual to Advanced Industrial Economics, 2nd ED Stephen
Martin
solutions manual to Advanced Macroeconomics, by David Romer
solutions manual to Advanced Modern Engineering Mathematics 3rd Ed
Glyn James
solutions manual to Advanced Modern Engineering Mathematics, 3rd Ed.,
by G. James
solutions manual to Aircraft Structures for Engineering Students (4th
Ed., T.H.G. Megson)
solutions manual to Algebra & Trigonometry and Precalculus, 3rd Ed By
Beecher, Penna, Bittinger
solutions manual to Algebra Baldor
solutions manual to Algebra-By Thomas W. Hungerford
solutions manual to Algorithm Design (Jon Kleinberg & Éva Tardos)
solutions manual to An Interactive Introduction to Mathematical
Analysis 2nd E (Jonathan Lewin)
solutions manual to An Introduction to Database Systems (8th Ed., C.J.
Date)
solutions manual to An Introduction to Modern Astrophysics (2nd Ed.,
Bradley W. Carroll & Dale A. Ostlie)
solutions manual to An Introduction to Numerical Analysis By Endre
Süli,David F. Mayers
solutions manual to An Introduction to Ordinary Differential Equations
(James C. Robinson)
solutions manual to An Introduction to Signals and Systems by John
Stuller
solutions manual to An Introduction to the Finite Element Method (3rd
Ed., J. N. Reddy)
solutions manual to An Introduction to Thermal Physics by Schroeder,
Daniel V
solutions manual to An Introduction to Thermodynamics and Statistical
Mechanics (2nd Ed, Keith Stowe)
solutions manual to Analog Integrated Circuit Design, by Johns,
Martin
solutions manual to Analysis and Design of Analog Integrated Circuits
(4th Edition) by Gray , Lewis , Meyer
solutions manual to Analytical Chemistry, Higson
solutions manual to Analytical Mechanics 7E by Grant R. Fowles, George
L. Cassiday
solutions manual to Antenna Theory 2nd edition by Balanis
solutions manual to Antennas for All Applications (3rd Ed., John Kraus
& Ronald Marhefka)
solutions manual to Applied Calculus for the Managerial, Life, and
Social Sciences, 7 E, by Soo T. Tan
solutions manual to Applied Econometric Time Series, 2nd Edition by
Enders
solutions manual to Applied Finite Element Analysis 2ed, by LJ
SEGERLIND
solutions manual to Applied Fluid Mechanics (6th Ed., Mott)
solutions manual to Applied Numerical Analysis, 7th Edition, by
Gerald, Wheatley
solutions manual to Applied Numerical Methods with MATLAB for
Engineers and Scientists( Steven C. Chapra)
solutions manual to Applied Partial Differential Equations (4th Ed.,
Haberman)
solutions manual to Applied Partial Differential Equations by J. David
Logan
solutions manual to Applied Quantum Mechanics ( A. F. J. Levi )
solutions manual to Applied Statistics and Probability for Engineers
( 2nd Ed., Douglas Montgomery & George Runger )
solutions manual to Applied Statistics and Probability for Engineers
(3rd Ed., Douglas Montgomery & George Runger)
solutions manual to Applied Strength of Materials (4th Ed., Mott)
solutions manual to Applying Maths in the Chemical and Biomolecular
Sciences, Beddard
solutions manual to Artificial Intelligence A Modern Approach 2e by
Russell, Norvig
solutions manual to Auditing and Assurance Services- An Integrated
Approach 12E by Arens
solutions manual to Auditing and Assurance Services, 12th edition,
Alvin A Arens, Randal J Elder, Mark Beasley
solutions manual to Automatic Control Systems, 8E, by Kuo, Golnaraghi
solutions manual to Basic Electrical Engineering By Nagrath, D P
Kothari
solutions manual to Basic Electromagnetics with Applications by
Nannapaneni Narayana Rao
solutions manual to Basic Engineering Circuit Analysis, 8th Edition by
J. David Irwin, R. Mark Nelms
solutions manual to Basic Heat and Mass Transfer by A. F. Mills
solutions manual to Basic Probability Theory by Robert B. Ash
solutions manual to Bayesian Core by Christian P. Robert and Jean-
Michel Marin
solutions manual to Bioprocess Engineering Principles (Pauline M.
Doran)
solutions manual to Business Statistics - Decision Making 7th E by
David F. Groebner
solutions manual to C++ for Computer Science and Engineering by Vic
Broquard
solutions manual to C++ How to Program 3rd edition - Deitel
solutions manual to Calculus - Early Transcendentals, 6th E, by Anton,
Bivens, Davis
solutions manual to Calculus - Early Transcendentals, 7E, by Anton,
Bivens, Davis
solutions manual to Calculus - Late Transcendentals Single Variable,
8th Ed by Anton, Bivens, Davis
solutions manual to Calculus (9th Ed., Dale Varberg, Edwin Purcell &
Steve Rigdon)
solutions manual to Calculus 2nd edition-M. Spivak
solutions manual to Calculus A Complete Course 6th Edition by by R.A.
Adams
solutions manual to CALCULUS An Intuitive and Physical Approach 2nd ed
by Morris Kline
solutions manual to Calculus and its Applications (11th Ed., Larry J
Goldstein, Schneider, Lay & Asmar)
solutions manual to Calculus by Gilbert Strang
solutions manual to Calculus early transcendentals 8th Ed, by Anton
Bivens Davis
solutions manual to Calculus Early Transcendentals, 5th Edition, JAMES
STEWART
solutions manual to Calculus George Thomas 10th ed Vol 1
solutions manual to Calculus of Variations MA 4311 LECTURE NOTES
( Russak )
solutions manual to Calculus One & Several Variables 8e by S Salas
solutions manual to Calculus Vol 2 by Apostol
solutions manual to Calculus With Analytic Geometry 4th ( Henry
Edwards & David E. Penney)
solutions manual to Calculus with Applications 8 Edition by Lial,
Greenwell, Ritchey
solutions manual to Calculus, 4th edition stewart
solutions manual to Calculus, An Applied Approach, 7E, by Larson
solutions manual to Calculus, Single and Multivariable, 4E.,Vol 1& Vol
2 by Hughes-Hallett,McCallum
solutions manual to Calculus, Single Variable, 3E by Hughes-
Hallett,McCallum
solutions manual to Chemical and Engineering Thermodynamics 3Ed by
Stanley I. Sandler
solutions manual to Chemical Engineering Design (Coulson &
Richardson's Chemical Engineering - Volume 6) - (4th Ed., Sinnott)
solutions manual to Chemical Engineering Volume 1, 6th Edition, by
Richardson, Coulson,Backhurst, Harker
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solutions manual to Classical Dynamics of Particles and Systems, 5th
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solutions manual to Classical Mechanics 2nd Ed by Goldstein
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solutions manual to CMOS- Circuit Design, Layout, and Simulation,
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solutions manual to Communication Networks, 2e, Alberto Leon-Garcia,
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solutions manual to Computational Techniques for Fluid Dynamics
Srinivas, K., Fletcher, C.A.J.
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solutions manual to Econometric Analysis, 5E, by Greene
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solutions manual to Econometrics: A Modern Introduction (Michael P.
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solutions manual to Elementary Differential Equations ( Werner E.
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solutions manual to Elementary Differential Equations and Boundary
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hibbeler
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Ross
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James C. Van Horne, Wachowicz
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solutions manual to Introduction to Commutative Algebra by M. F.
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solutions manual to Introduction to Electric Circuits, 6E, Dorf
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solutions manual to Introduction to Linear Algebra, 3rd Ed., by
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solutions manual to Introduction to Mathematical Statistics (6th Ed.,
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solutions manual to Introductory Quantum Optics (Christopher Gerry &
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Leon)
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solutions manual to Linear Systems And Signals, 1stE, B P Lathi
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solutions manual to Machine Design : An Integrated Approach (3rd Ed.,
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solutions manual to Materials and Processes in Manufacturing (9th Ed.,
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solutions manual to Materials Science and Engineering- An Introduction
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solutions manual to Mathematical Analysis, Second Edition by Tom M.
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solutions manual to Mathematical Methods for Physicists 5 Ed, Arfken
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solutions manual to Mathematical Methods in the Physical Sciences; 3
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solutions manual to Mathematical Techniques 4th ED by D W Jordan & P
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solutions manual to Mechanical Vibrations (3rd Ed., Rao)
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solutions manual to Microeconomic Analysis, 3rd Ed., by H. Varian
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solutions manual to Modern Control Engineering 3rd Ed. - K. OGATA
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==============================================================================
TOPIC: no investment earn part time
http://groups.google.com/group/comp.lang.c/t/e9016b1480907351?hl=en
==============================================================================
== 1 of 2 ==
Date: Sat, Feb 20 2010 9:28 pm
From: Gouri Pusarla
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Date: Sat, Feb 20 2010 9:31 pm
From: Gouri Pusarla
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==============================================================================
TOPIC: Efficency and the standard library
http://groups.google.com/group/comp.lang.c/t/ad9fea19f2f7dd61?hl=en
==============================================================================
== 1 of 7 ==
Date: Sat, Feb 20 2010 9:31 pm
From: spinoza1111
On Feb 21, 6:53 am, i...@localhost.claranet.nl (Ike Naar) wrote:
> In article <11cfb776-8159-4a97-b069-11952904f...@s36g2000prh.googlegroups.com>,
>
> spinoza1111 <spinoza1...@yahoo.com> wrote:
> >On Feb 20, 8:20 pm, blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> >> [snip]
> >While thanking Ben, and rightfully so, for his help, you might have
> >had the common decency to also acknowledge theft of ideas (TESTER
> >macro, test suite, etc.) from me.
>
> Your TESTER macro and test suite use a few ideas from others, too.
That is not the case, for the most part. The style diverges
considerably from that used here.
Of course, the tester macro used GOOD ideas used before such as
parenthesizing formal parameters, and it is well known that reusable
test suites are good things. But: these ideas are seldom used here and
are falling into desuetude in America, because in fact they attract
mockery and complaints when consistently applied. The ideas I put
forth a solidly expressed enough to be stealable, and part of the
theft of intellectual property is the mockery and marginalization of
the original producer.
== 2 of 7 ==
Date: Sat, Feb 20 2010 9:38 pm
From: spinoza1111
On Feb 21, 5:09 am, Seebs <usenet-nos...@seebs.net> wrote:
> On 2010-02-20, blmblm myrealbox.com <blm...@myrealbox.com> wrote:
>
> > But apparently there are some exceptions -- I mean, whatever I may
> > think of the content and style of Mr. Nilges's posts, the spelling
> > and grammar and so forth are generally impeccable, aside from the
> > occasional typo. "Just sayin'."
>
> Yeah. But the general rule seems to be that an area of carelessness suggests
> there will be others. So it's reasonable to infer from <malloc.h> that the
> rest of the code is *likely* to be poor.
Wow, is that so? Actually, the inclusion of malloc.h resulted from a
relative ignorance of C and not programming or English on my part. I
have said before that I know LESS about C than the regs here, but MORE
about programming, because I can see that the regs are mentally and
morally corrupted by the bad design of C. So its inclusion could
predict not "carelessness" but its opposite: due diligence in an
unfamiliar language.
Furthermore, Peter, we've seen in your "off by one stringlength" some
far more serious carelessness from a "C expert".
Furthermore, you've never confirmed that the rest of the code *is*
poor. You prefer, in the corporate-shithead register, to stay at the
level of likelihood because for you, "swift boating" people has
completely replaced learning your profession. It only had to be proven
in the 2004 election that John Kerry MIGHT have not been a military
hero in the brown-water riverine Navy during Vietnam, likewise you (on
record as a Bush supporter) need, you think, only to conduct hit and
run raids on people's reputations and standing, starting with Schildt.
>
> -s
> --
> Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nos...@seebs.nethttp://www.seebs.net/log/<-- lawsuits, religion, and funny pictureshttp://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
== 3 of 7 ==
Date: Sat, Feb 20 2010 9:41 pm
From: spinoza1111
On Feb 21, 4:46 am, Kelsey Bjarnason <kbjarna...@gmail.com> wrote:
> [snips]
>
> On Sat, 13 Feb 2010 22:17:10 -0800,spinoza1111wrote:
> > No argument there, none whatsoever. But lemme ask you a question. Where
> > the fuck do you get off criticising people who are, if not perfect,
> > better than you? People like Schildt?
>
> Would that be the same Schildt who thinks main can be declared however
> you damn well please, who thinks feof should be checked _after_ using the
> value read from the file, rather than before, who thinks bytes are always
> 8 bits, who thinks C is restricted to the ASCII character set, who
> thinks...
No, because you've bought a set of trivial truths, errata that should
have gone to McGraw Hill, and lies as being == Schildt who in fact is
a generalist whose enemies concede is "clear", which necessarily means
"understandable", which in turn, necessarily means true. The Swift
Boating of Schildt was started by a clown who is present in this
discussion, Seebs, and his lack of diligence or respect for the
standing of others is on display as I write.
>
> Anyone who has read even a basic introductory text on C is qualified to
> critize Schildt.
== 4 of 7 ==
Date: Sat, Feb 20 2010 9:54 pm
From: spinoza1111
On Feb 21, 2:42 am, Seebs <usenet-nos...@seebs.net> wrote:
> On 2010-02-20, Richard Heathfield <r...@see.sig.invalid> wrote:
>
> >spinoza1111wrote:
> >> Including (or omitting) malloc.h is not an indicator of more serious
> >> problems.
> > Actually, it is. I do not expect you to understand this.
>
> Lemme jump to a totally unrelated field to explain/support this:
>
> World of Warcraft. Popular game, many people play it. There's a broad
> range of player skill. Some players are quite good. Some are quite bad.
>
> Imagine that you want to know whether someone is good or bad. Certainly,
> watching them play for a while can give you a pretty good idea. But you
> know what else can give you a pretty good idea? Reading anything they write.
> If they can't spell, they're probably bad. If they can spell, they're
> probably good.
>
> This may seem like it ought to be unrelated. Strictly speaking, it's
> not a guarantee; I know some skilled players who can't spell, and I know
> some good spellers who don't play very well.
>
> But by and large:
>
> Attention to detail is a character trait.
>
> People who are careful and thoughtful in one area are usually careful and
> thoughtful in others. People who don't care in one area usually don't
> care in others.
>
> Thus, someone who includes <malloc.h> is likely to make mistakes based on
> a characteristic habit of picking things up without really understanding them,
> or various superstitions unsupported by the nature of the language. For
> instance, I'd expect such a person to try to duplicate the features of the
> C library, but do it poorly, and introduce multiple bugs into a hundred
> line version of something that should have been under twenty lines and not
> needed noticeable debugging.
* There were five bugs, all of which have been fixed in the first,
and one of the few, solutions posted (the others were by io_x and
willem, and not you). Those bugs are in the Change Record with the
code for all too see and traceback
* That bug list, and other forms of diligence seldom seen here or on
the job, is why the code isn't twenty lines. If you take out the
TESTER calls (which provide a reusable testing resources that
competent participants in this discussion have found useful) and the
comments there are fewer than one hundred lines and even fewer C
statements, where the lines have been diligently formatted for
readability.
* You lack of standing was evident when you could not post a three
line strlen replacement without a recruit-level error, and when you
triggered this discussion by mistakenly thinking that the correct way
to find the string %s is to find the character &, and punt...even when
string.h provides string search.
* My decision to abandon string.h was after years of using it, back
in the day. It has a bad way of representing strings.
>
> -s
> --
> Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nos...@seebs.nethttp://www.seebs.net/log/<-- lawsuits, religion, and funny pictureshttp://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
== 5 of 7 ==
Date: Sat, Feb 20 2010 9:56 pm
From: spinoza1111
On Feb 21, 2:19 am, blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> In article <7uakq2F2j...@mid.individual.net>,
>
> blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> > In article <11cfb776-8159-4a97-b069-11952904f...@s36g2000prh.googlegroups.com>,
> >spinoza1111 <spinoza1...@yahoo.com> wrote:
> > > On Feb 20, 8:20 pm, blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> > > > In article
> > <0.00098760756d7ac80921.20100219184823GMT.87zl35dpu0....@bsb.me.uk>,
> > > > Ben Bacarisse <ben.use...@bsb.me.uk> wrote:
>
> [ snip ]
>
> > "Theft"? At worst I think I'm guilty of not being as explicit as
> > I might have been about sources. It was certainly not my intent to
> > "steal" any of your work, or to present it as my own, and I'm sorry
> > if that's how it comes across.
>
> [ snip ]
>
> > But if you want to claim that I should have been more explicit
> > that these were your tests and not mine, well, fair enough, and
> > I do apologize for that.
>
> > If I post further versions of my code I will do what I can to
> > make sure credit is given where due.
>
> Looking over what I posted .... Oh dear. I really *should* have
> put something at the top of the file "spinoza-tests.c" indicating
> that those lines were copied verbatim from your test suite -- but
> the intent, again, was to keep to a common frame of reference,
> and perhaps provide an easy way for others to run your tests,
> rather than to plagiarize.
>
> Proposed comments for the file containing the tests:
>
> /*
> * The "spinoza1111tests", as developed by Edward Nilges.
> * This version is copied from Usenet post Message-ID [whatever].
> */
>
> (I'm not actually sure I correctly copied and pasted the latest
> version of your tests. Something else to fix.)
>
> Proposed comments for the file containing the driver code:
>
> /*
> * Correctness tests use the TESTER macro interface proposed
> * by Edward Nilges in [another reference to a Usenet post].
> */
>
> [ snip ]
>
> --
> B. L. Massingill
> ObDisclaimer: I don't speak for my employers; they return the favor.
Thanks for this, I appreciate it.
== 6 of 7 ==
Date: Sat, Feb 20 2010 10:03 pm
From: spinoza1111
On Feb 21, 1:34 am, blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> In article <11cfb776-8159-4a97-b069-11952904f...@s36g2000prh.googlegroups.com>,
>
> spinoza1111 <spinoza1...@yahoo.com> wrote:
> > On Feb 20, 8:20 pm, blm...@myrealbox.com <blm...@myrealbox.com> wrote:
> > > In article <0.00098760756d7ac80921.20100219184823GMT.87zl35dpu0....@bsb.me.uk>,
> > > Ben Bacarisse <ben.use...@bsb.me.uk> wrote:
>
> > > > blm...@myrealbox.com <blm...@myrealbox.com> writes:
>
> [ snip ]
>
> > > (Thanks for taking the time to comment on my code, by the way!
> > > In my thinking you're one of the group's respected regulars .... )
>
> [ snip ]
>
> > > ======== file tester.c ========
>
> [ snip ]
>
> > > read more
>
> (For the record, the part of my post you quoted includes only about
> about half of my code, since apparently Google by default doesn't
> present the entirety of long posts .... )
>
> > While thanking Ben, and rightfully so, for his help, you might have
> > had the common decency to also acknowledge theft of ideas (TESTER
> > macro, test suite, etc.) from me.
>
> "Theft"? At worst I think I'm guilty of not being as explicit as
> I might have been about sources. It was certainly not my intent to
> "steal" any of your work, or to present it as my own, and I'm sorry
> if that's how it comes across.
>
> I call your attention to the following lines from my code, first
> where I define my implementation of a TESTER macro:
>
> /*
> * macro to perform one correctness test
> *
> * conforms to thespinoza1111interface to allow easy copy/paste of his tests;
> * first parameter is unneeded for my code
> */
> #define TESTER(ignored, in, old_text, new_text, expected) \
> one_test(in, old_text, new_text, expected, &test_count, &error_count, 1);
>
> I would have thought that the above comments at least make it clear
> that my implementation of a TESTER macro conforms to an interface
> defined by someone else -- identified somewhat cryptically as
> "spinoza1111", but I thought that would be enough for anyone who
> follows this group at all. It didn't really occur to me that the
> idea of such a macro was startlingly original and something one would
> need to give credit for, but if you think it is -- oh, I don't know.
>
> If I were really intending to steal your ideas, would I have
> mentioned you at all? I suppose that comment about making it easy
> to copy/paste might come across that way, but really -- my intent
> was to make it easy to keep up with your evolving test suite and
> thereby demonstrate that my proposed solution(s) "work" according
> to your criteria.
>
> And then at the point where I actually invoke your tests:
>
> fprintf(stdout, "spinoza1111tests\n\n");
>
> I suppose I thought this would make it clear enough to anyone
> following the relevant discussion that I was proposing to run
> tests proposed/invented/something by thisspinoza1111entity.
>
> Thanking you .... Before I did that I would want to examine the
> actual tests more closely; I have not looked at them carefully
> enough to have an opinion about their quality. My idea was to
> use your tests rather than inventing my own as a way of keeping
> to a common frame of reference.
>
> But if you want to claim that I should have been more explicit
> that these were your tests and not mine, well, fair enough, and
> I do apologize for that.
>
> If I post further versions of my code I will do what I can to
> make sure credit is given where due.
>
> > I understand that you're probably
> > afraid of the regs here who use "the politics of personal destruction"
> > so readily, and part of their strategy is to make people afraid to
> > associate with their target do jour...here a person who's exposed
> > their incompetence. But you might have acted like a man.
>
> Why would I want to act like a man? (I'm not one.)
Because in fact men have been in most societies definitional of full
humanity. This is unfair to women but the fact is that in patriarchal
societies most women haven't been independent enough for us to make
all but a few (Joan of Arc, Marie Curie, Sophie Germaine) into
exemplars of what it is to be human.
When I use the words, "act like a man" I mean acting like a free and
independent moral agent who tries to do the right thing, like my
father for example, or me at my best. I think most of the male posters
here are not men but guys.
>
> I think I won't address the question of whether I want to associate
> with you, or be perceived as associated with you, and why.
I think these newsgroups are being misused by people who find their
ease of access useful in establishing chops they don't have, and I
think these people do this by trying to ruin reputations.
>
> I will note that some years ago in a thread in comp.programming
> I'm pretty sure I backed you up in a tangential dispute about --
> something about how things are done in assembler language on
> IBM mainframees, if I remember right. I could try to look up
> details if anyone's interested, but between the vagueness of my
> recollection and the various shortcomings of Google's interface
> to its archives, I don't know ....
>
> --
> B. L. Massingill
> ObDisclaimer: I don't speak for my employers; they return the favor.
== 7 of 7 ==
Date: Sat, Feb 20 2010 10:10 pm
From: spinoza1111
On Feb 21, 1:00 am, Malcolm McLean <malcolm.mcle...@btinternet.com>
wrote:
> On Feb 20, 9:45 am, Richard Heathfield <r...@see.sig.invalid> wrote:>spinoza1111wrote:
>
> > > In the example, you just take out malloc.h and test everything.
>
> > That's your job.
>
> So we've got version 1 which uses malloc.h. The person who receives
> the code say "Oh Oh, no good" and makes it stdlib.h.
> Now the code isn't the same. So if we give a bug report to the writer
> of version 1, we have to say that we were using a different version,
> and he might say "well it's no longer my problem". So you need to
> repeat the bug with version 1, which takes an extra day. Even with
> perfect goodwill, you create layers of bureaucracy.
>
> Naturally, when you make a change, you test everything. The problem is
> that the person doing the testing "knows" that all he's done is
> repalce a non-standard header. So nothing can go wrong, right? And 99%
> of the time, he'll be right. So it creates a sort of sense of
> unnecessary work, mandated by pointless regulations. We need the code
> urgently, so tester skimps on the unit tests. Again 99% of the time
> he's right. But discipline has slipped. We no longer have a bullet-
> proof testing system.
>
> That's the way with code. The trivial is important, because the whole
> point of computers is that they can perform trivial tasks, without
> human intervention.
All very true, and well-expressed. But my conclusion has already been
expressed: don't use C for this level of industrial code. When you
have OO languages, "including the right libraries" simply isn't as big
of a problem. Libraries, as compared to objects, are too crude for
modern development because they redefine too much.
Were we doing the sort of collaborative development for which Richard
and Seebs aren't qualified, we would have to agree to include a high-
level .h file which would do all of the standard includes in turn, and
we'd then forget what's needed and have to look it up when outside of
the collaborative development environment. The industrial and
collaborative development of C code in my view always requires
considerable work on idiomatic approaches to the point that shippable
source code looks nothing at all what people here think is C. It looks
more like my code, in fact, minus trivial blunders like malloc.h
(which was removed when Heathfield pointed it out).
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