Interface matrix_product_sub

Overloaded multiplication for matrix $\times$ matrix in subroutine form, with no return value allocated on the stack

lhs -- intent(out), dimension(:,:) or dimension(:), real(dp) or complex(dp)

matrix1 -- intent(in), dimension(:,:), real(dp) or complex(dp)

matrix2 -- intent(in), dimension(:,:), real(dp) or complex(dp)

m1_transpose, m2_transpose -- logical, intent(in), optional

lhs_factor, rhs_factor -- intent(in), optional, real(dp) or complex(dp)

m1_conjugate, m2_conjugate -- logical, intent(in), optional

matrix -- real(dp), intent(in), dimension(:,:)

vector -- real(dp), intent(in), dimension(:)

m_transpose -- logical, intent(in), optional

operator(.multd.) interface