[Rd] coerce SEXP type to C++ matrix class and back

[kklot]

perhaps you don't need this anymore but now after extract the dimension m, n,
we can simply generate arma matrix as
mat an_arma_mat(REAL(RA), m, n);
similarly you can convert RB to an arma matrix pointer, operate on it then
return directly RB to R.


I am testing a simple C++ function that takes a double matrix as
argument and which uses routines provided by the C++ Armadillo
package. I am aware of the nice capabilities of Rcpp and RcppArmadillo
which helps simplifying a lot and that I have already successfully
tested. However, I had a hard time trying to figure out how the
coercion from a REALSPX matrix to an arma::mat = arma::Mat<double>
matrix (double matrix in Armadillo) is done. In this particular case,
because of the simplicity of my function, I would like to use base R
only.



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