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Re: bug in gsl_ran_chisq_pdf

Martin Jansche writes:
 > Anyway, I haven't seen an explicit statement about the desired
 > behavior of the _pdf functions when the main argument is outside the
 > domain of definition.  Personally, I find the currently implemented
 > behavior reasonable: the univariate PDFs in GSL are defined on
 > single intervals, and the _pdf functions return 0 for values outside
 > the interval (the _cdf functions would have to return 0 below the
 > defined interval and 1 above).

I have in mind,
 
return 0 outside valid range (as currently)
return NaN for invalid parameters (not actually implemented)
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