#include <boost/qvm/map_vec_mat.hpp>
namespace boost { namespace qvm { //Only enabled if: is_vec<A>::value template <iclass A> -unspecified-return-type- diag_mat( A & a ); } }
The expression diag_mat(v) returns a view proxy that accesses the vector v as a square matrix of the same dimensions in which the elements of v appear as the main diagonal and all other elements are zero.
Note: the returned matrix type is effectively a scaling matrix.