#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.