Function lupnt::Vech

• Defined in File math_utils.h

Function Documentation

VecX lupnt::Vech(const MatX &x)

Half-vectorization of a square matrix: stack the lower-triangular elements (including the diagonal) column-wise into a vector.

Parameters:

x – Square input matrix (size n x n)

Returns:

Vector of length n*(n+1)/2 containing the lower-triangular elements of x