bugGNU Scientific Library - Bugs: bug #42502, wrong results of the function...


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bug #42502: wrong results of the function gsl_cdf_ugaussian_Pinv

Submitter:  Patrick Alken <psa>
Submitted:  Tue 03 Jun 2014 06:51:52 PM UTC
Category:  Runtime error Severity:  3 - Normal
Operating System:  Status:  None
Assigned to:  None Open/Closed:  Open

Tue 03 Jun 2014 06:51:52 PM UTC, original submission:  

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

int main(){
    double x= 0.5;
    double res = gsl_cdf_ugaussian_Pinv(x);
    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

Patrick Alken <psa>
Group administrator


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