Method fill_diag

inst/include/Rcpp/vector/Matrix.h:120–122

    template <typename U>
    void fill_diag( const U& u) {
      fill_diag__dispatch( typename traits::is_trivial<RTYPE>::type(), u ) ;
    }

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