Rtools4.0 and Rstan

General
1

When I use Rstan, I have some trouble in solve it. Now I use the Rtools 4.0,but I met some problems:
Warning messages:
1: In system(paste(CXX, ARGS), ignore.stdout = TRUE, ignore.stderr = TRUE) :
‘C:/rtools40/usr/mingw_/bin/g++’ not found

Now can you give me some suggestions about the Rtools4.0 and Rstan，and then how to solve it
Thank you very much.

2

Hi, that warning is harmless and safe to ignore. Did you have any other issues?

3

OK ，But I also have some troubles about it. When I do a program, The result of one run is very good.
I ran the program through 100 times, but found that some of the results were quite different from the real parameters. Can you give me some suggestions?