I need C++ tutoring

[Mauricio Vargas Sepúlveda]

Hi!

I'm looking for an instructor who can explain me how to correctly write 
a C++ function.

I know some Rcpp and I need to translate a function to cpp11 (R). I have 
some funds to pay for tutoring.

What I'm experiencing is described here: 
https://github.com/pachadotdev/fixest/issues/18#issuecomment-1213446848

And the error is here: 
https://github.com/pachadotdev/fixest/issues/18#issue-1336440950

My assumption is that it's because of passing a vector to each 
coordinate of a vector (i.e., a matrix-like), but my C++ grammar is not 
very refined for thing like this.

Best,