[Bug-gsl] [bug #29139] segfault in Chebyshev series derivatives for n=1

[Brian Gough]

URL:
  <http://savannah.gnu.org/bugs/?29139>

                 Summary: segfault in Chebyshev series derivatives for n=1
                 Project: GNU Scientific Library
            Submitted by: bjg
            Submitted on: Tue 09 Mar 2010 03:35:04 PM GMT
                Category: Runtime error
                Severity: 3 - Normal
        Operating System: 
                  Status: Confirmed
             Assigned to: None
             Open/Closed: Open
                 Release: 1.13
         Discussion Lock: Any

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Details:

From: Jerry Gagelman <address@hidden>
To: address@hidden
Subject: [Bug-gsl] Chebyshev series derivatives
Date: Wed, 3 Mar 2010 10:03:27 +0100

Dear bug list,

I have found that the function gsl_cheb_calc_deriv() issues a segmentation
fault when both the Chebyshev series and the series for its derivative are
allocated for order N=1. No other value of N seems to effect the same error.
There are two different installations of the GSL that I use at home versus
at work: GSL 1.11 on Linux OpenSUSE 11.0, and GSL 1.12 on OS X 10.6
(installed via macports). The test code that I have included below produces
the same error on both systems.

Yours,
Jerry Gagelman


/* gsl_cheb_bug.c */

#include <stdlib.h>
#include <gsl/gsl_chebyshev.h>

int
main(int argc, char** argv)
{
    int N = 1;
    double c[2] = {0, 1};     /* initialize series as T_N */

    gsl_cheb_series S = {c, N, -1, 1};
    gsl_cheb_series* DS = gsl_cheb_alloc(N);
    gsl_cheb_calc_deriv(DS, &S);

    gsl_cheb_free(DS);
    return 0;
}





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