vech

Returns elements of lower triangle of a square matrix in a vector, ordered column-wise.

Trust region algorithm for nonlinear optimization. In
        addition to being more stable and robust than optim, this
        package includes methods that are scalable and efficient (in
        terms of both speed and memory usage) when the Hessian is
        sparse.

vech: vech operator on a square matrix

Description

Usage

Arguments

Value