Follow-up Comment #2, bug #43326 (group gsl): First order patch in this case means: 1- test cases not provided, although something like the sample code below proves the result 2- solution does not work in conjunction with histograms, as this will yield a xmin larger than xmax error; however, given that the case is degenerate, more than likely other error messages will be presented too.
#include <stdio.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
int
main (void)
{
for (int k = 3; k >= 0; k--)
for (double mu_ = 1; mu_ >= 0; mu_ -= 0.1)
printf("%d\t%.1f\t%f\n", k, mu_, gsl_ran_poisson_pdf(k, mu_));
return 0;
}
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