[Rd] Is it a good choice to increase the NCONNECTION value?

At least in 2015, a github user, tobigithub, submit an [issue](https://github.com/sneumann/xcms/issues/20) about the error "Error in file(con, "w") : all connections are in use" Nowadays, since AMD have really cool CPUs which increases the thread numbers to 128 or even 256 on a single server, we

[Rd] Bug report: R.home() cause package Rcpp failed executing sourceCpp, similar bug are labeled "BUG 16660" since 2016 and here I could provide a solution that tested in my laptop.

https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=16660 Here is the bug, which R.home may generate a path contains a whitespace. this will cause Rcpp failed executing sourceCpp > sourceCpp("b:/2018-12-14/src/18020/MCMC.cpp") Error in system(cmd, intern = !showOutput) : 'D:/Program' not found

[Rd] Bug report: Function ppois(0:20, lambda=0.9) does not generate a non-decreasing result.

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)https://stat.ethz.ch/mailman/listinfo/r-devel