Hello,
I have tried to compute 2F1(11, -1 ; 11/2; 0.125) and I got an error message
(below is my sample program).
However 2F1(-1, 11 ; 11/2; 0.125) provides the right result 0.75
Am I wrong somewhere ?
I did not find any indication in archives.
Thank you for your help.
All the best,
Didier
-----------------------------------------------------------------------------
/* bug_gsl.c */
/* 2F1(11,-1 ; 11/2 ; 1/8) = 0.75 */
/* Didier Pinchon, 8 Nov 2008 */
#include <stdio.h>
#include <stdlib.h>
#include "gsl_math.h"
#include "gsl_sf_hyperg.h"
int main()
{
double a,b,c,r, res;
a = 10.0;
b = -1.0;
c = 5.5;
r = 0.125;
res = gsl_sf_hyperg_2F1(a,b,c,r);
printf("res = %20.14e\n", res);
return EXIT_SUCCESS;
}
/* Compilation and execution:
$ gcc -o bug_gsl -I/usr/local/include/gsl bug_gsl.c -L/usr/local/lib -lgsl -lm
$ ./bug_gsl
gsl: hyperg_2F1.c:750: ERROR: error
Default GSL error handler invoked.
Abandon
*/
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