Adds C++ engine for gmultmix and makes it the default. In my tests it's about 8-13x faster than the R engine. It works for both Poisson and negative binomial but only for the two built-in piFun options (removal, double). If the user provides a custom piFun it gives a warning and drops back to the R engine. I think you can use an arbitrary R function in C++ via Rcpp but at that point you probably lose most of the speed advantage, so I didn't try to implement that.
I added tests and also had to update the vignette for gmultmix since it uses a custom piFun.
Adds C++ engine for
gmultmixand makes it the default. In my tests it's about 8-13x faster than the R engine. It works for both Poisson and negative binomial but only for the two built-in piFun options (removal, double). If the user provides a custom piFun it gives a warning and drops back to the R engine. I think you can use an arbitrary R function in C++ via Rcpp but at that point you probably lose most of the speed advantage, so I didn't try to implement that.I added tests and also had to update the vignette for gmultmix since it uses a custom piFun.
Here's an R script to benchmark the C engine: gmultmix_C_example.txt