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
Actually,
> ppois(19,lambda=0.9)<ppois(18,lambda=0.9)
[1] TRUE
Which could not be TRUE.
Code is tested in both R 3.5.1 and Microsoft R Open 3.5.1.
_
platform x86_64-w64-mingw32
arch x86_64
os mingw32
system x86_64, mingw32
status
major 3
minor 5.1
year 2018
month 07
day 02
svn rev 74947
language R
version.string R version 3.5.1 (2018-07-02)
nickname Feather Spray
PS. if set lambda=1, such bug will not appear.
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