Le 04/12/2018 à 19:12, Martin Maechler a écrit :
I have not doubt about it. My "economic way" was related to get ppois() *non decreasing*, at least, more economic than exp-log.p trick.Serguei Sokol on Tue, 4 Dec 2018 11:46:32 +0100 writes:> Le 04/12/2018 à 11:27, Iñaki Ucar a écrit : >> On Tue, 4 Dec 2018 at 11:12, <qwey...@mail.ustc.edu.cn> wrote: >>> function ppois is a function calculate the CDF of Poisson distribution, it should generate a non-decreasing result, but what I got is: >>> >>>> any(diff(ppois(0:19,lambda=0.9))<0) >>> [1] TRUE ... > any(diff(exp(ppois(0:19, lambda=0.9, log.p=TRUE))) < 0) > #[1] FALSE> But may be there is another, more economic way? Well, log probabilites *are* very economic for many such p*() functions.
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