Matrix Calculus |

" There is relatively less published pertaining to matrix-valued convex sets and functions. A partial remedy for venturing into hyperdimensional representations, such as the One advantage to vectorization is existence of a traditional two-dimensional matrix representation for the second-order gradient of a real function with respect to a vectorized matrix. To disadvantage is a large new but known set of algebraic rules and the fact that its mere use does not generally guarantee two-dimensional matrix representation of gradients. |