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[Help-gsl] Beginner help with gsl_ran_chisq_pdf

From: Regis Smith
Subject: [Help-gsl] Beginner help with gsl_ran_chisq_pdf
Date: Sun, 03 Jun 2012 17:48:13 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120427 Firefox/10.0.4 Iceape/2.7.4

I'm using GSL 1.14 on Debian Squeeze, and can't seem to get the chi
square pdf to work.

// file chisq_pdf.c

int main(int argc, char** argv)
    double x=atof(argv[1]), df=atof(argv[2]);
    printf("x=%f; df=%f; pdf=%f\n",x,df,gsl_ran_chisq_pdf(x,df));

    return 0;
// end file

I compile with "gcc chisq_pdf.c -lgsl -lgslcblas -lm -o chisq_pdf", but
all inputs give me zero.

$ ./chisq_pdf 4 3
x=4.000000; df=3.000000; pdf=0.000000
$ ./chisq_pdf 0 2
x=0.000000; df=2.000000; pdf=0.000000
./chisq_pdf 3 4
x=3.000000; df=4.000000; pdf=0.000000

I must be making an embarrassingly silly error.  Please help!  Thanks!


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