... something for tomorrow.

It's apparently a problem with the gsl library:

/*
This file: gsl_spmatrix.c
Modify the following "-I..." and "-L..." arguments accordingly.

Using the gsl-2.6 library that ships with Strawberry Perl 5.32.1-PDL, 
+build with:
gcc -o gsl_spmatrix.exe gsl_spmatrix.c -ID:/sp/_64/sp-5.32.1-PDL/c/inc
+lude -LD:/sp/_64/sp-5.32.1-PDL/c/lib -lgsl -lgslcblas -lm

Then execute gsl_spmatrix.exe

Using the gsl-2.7.1 library provided by Alien, build with:
gcc -o gsl_spmatrix.exe gsl_spmatrix.c -ID:/sp/_64/sp-5.32.1/perl/site
+/lib/auto/share/dist/Alien-GSL/include -LD:/sp/_64/sp-5.32.1/perl/sit
+e/lib/auto/share/dist/Alien-GSL/lib -lgsl -lgslcblas -lm

Then execute gsl_spmatrix.exe
*/
#include <stdio.h>
#include <stdlib.h>
#include <gsl/gsl_spmatrix.h>

int main(void) {
 size_t v = 1;
 v <<= 32;
 v += 1;
 printf("size of size_t is %d bytes\n", sizeof(size_t));
 gsl_spmatrix *m = gsl_spmatrix_alloc(1,1);
 gsl_spmatrix_set( m, 1, 0, 1.5 );
 printf("1: got: %f\n", gsl_spmatrix_get( m, 1, 0));
 printf("1: nnz: %d\n", gsl_spmatrix_nnz( m ));
 gsl_spmatrix_set( m, v, 0, 1.75 );
 if (v >= m->size1) printf("will be reported as 'out of range'\n");
 printf("2: got: %f\n", gsl_spmatrix_get( m, v, 0 ));
 printf("2: nnz: %d\n", gsl_spmatrix_nnz( m ));
 return 0;
}


/*
As is, the built executable outputs (for both gsl-2.6 and gsl-2.7.1):

D:\C>gsl_spmatrix.exe
size of _size_t is 8 bytes
1: got: 1.500000
1: nnz: 1
will be reported as 'out of range'
gsl: getset_source.c:27: ERROR: first index out of range
Default GSL error handler invoked.

But if the line "v += 1;" is changed to "v += 2" or to "v += 3" or to 
+"v += 0" then the output is:

D:\C>gsl_spmatrix.exe
size of _size_t is 8 bytes
1: got: 1.500000
1: nnz: 1
2: got: 1.750000
2: nnz: 2
*/
[download]

I haven't yet reached an understanding of the problem.
I think it should be reported to the gsl developers unless that has already been done.

Cheers,
Rob

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.