[Rcpp-devel] Map Eigen MatrixXf?

[Charles Determan]

I have been exploring the use of RcppEigen more recently and stumbled upon
an issue when passing R objects.  Is there a way to pass an R matrix and
get it in to a mapped Eigen MatrixXf object?  I know R doesn't have a
native float type so I am not overly surprised that I have run in to this
issue.

For example, the following works simply when expecting a double matrix.

#include <RcppEigen.h>

// [[Rcpp::depends(RcppEigen)]]

using Eigen::Map;
using Eigen::MatrixXd;

// [[Rcpp::export]]
void floatMatrix(Map<MatrixXd> M){
    std::cout << M << std::endl;
}

However, when I try to change MatrixXd to MatrixXf the compilation fails
stating:

    no matching function for call to 'eigen::Map<Eigen::Matrix<float, -1,
-1> ::Map(Rcpp::Vector<14, Rcpp::PreserveStorage>::iterator, int&, int&)'

I tried searching around online if I could downcast the Mapped MatrixXd but
I have been unsuccessful.  Any insights would be appreciated.

Regards,
Charles
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