Follow-up Comment #5, bug #47646 (project gsl): [From Yu]
Patrick, I was thinking if it's worthwhile to allow the use of close-form cdf for some functions. Currently, the test routine calculates the expected probability in each bin using numerical integration of pdf. In this particular case, it blows up. Using cdf in stead of integration can avoid the problem, but I am not sure if this is appropriate. There are other functions with close-form cdf as well, and I am wondering whether it can be used to replace integration as well. In a modified test routine, I added a flag to indicate whether the input function ``pdf" is actually a cdf, and if that is the case, the probability in each bin would be simply cdf[x+dx] - cdf[x]. Please see the relevant lines here https://github.com/ohliumliu/gsl-playground/blob/issue2/scratchpad/test_beta_small.c#L461-#L464 One obvious issue is that in this function, the input ``pdf" could mean pdf or cdf depending on the value of the flag. This may be confusing. Without much experience in numerical computation, maybe I am proposing something crazy. Best, yu _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?47646> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
