Method diag

inst/include/Rcpp/vector/Matrix.h:124–128

    }

    template <typename U> static Matrix diag( int size, const U& diag_value ) {
      Matrix res(size,size) ;
        res.fill_diag( diag_value ) ;
        return res ;
    }

    inline Proxy operator[]( R_xlen_t i ) {
      return static_cast< Vector<RTYPE>* >( this )->operator[]( i ) ;