tri_to_full: Expands lower triangular to full matrix.
Description
Expands lower triangular to full matrix.
Usage
tri_to_full(lower_tri, n)
Arguments
lower_tri
A matrix representing the lower triangular part of the matrix,
stacked in column-major order
n
The number of rows (columns) in the full square matrix.
Value
A matrix that is the scaled expansion of the lower triangular matrix.
