Method ncol

inst/include/Rcpp/vector/Matrix.h:94–96

    explicit Matrix( const no_init_matrix& obj) : VECTOR(Rf_allocMatrix(RTYPE, obj.nrow(), obj.ncol())), nrows(obj.nrow()) {}

    inline int ncol() const {
        return VECTOR::dims()[1];
    }
    inline int nrow() const {
        return nrows ;
    }