[Bug-gsl] [bug #42502] wrong results of the function gsl_cdf_ugaussian_Pinv

[Patrick Alken]

URL:
  <http://savannah.gnu.org/bugs/?42502>

                 Summary: wrong results of the function gsl_cdf_ugaussian_Pinv
                 Project: GNU Scientific Library
            Submitted by: psa
            Submitted on: Tue 03 Jun 2014 06:51:52 PM GMT
                Category: Runtime error
                Severity: 3 - Normal
        Operating System: 
                  Status: None
             Assigned to: None
             Open/Closed: Open
                 Release: 
         Discussion Lock: Any

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Details:

#include <gsl/gsl_math.h>
#include <stdio.h>

int main(){
    double x= 0.5;
    double res = gsl_cdf_ugaussian_Pinv(x);
    printf("icdf(%f)=%f\n",x,res);
    return 0;
}

For some reason the output is: *icdf(0.500000)=1.000000*

Which is wrong, it should be: *icdf(0.500000)=0.000000 (because P(X<0)=0.5)*

submitted by dafna3 =at= gmail.com




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