Grocer Function
NAME
vech - stacks a symmetric matrix
CALLING SEQUENCE
[v]=vech(x)
PARAMETERS
Input
Output
- v = output vector containing stacked columns of x
DESCRIPTION
Creates a column vector by stacking columns of x on and below the diagonal
EXAMPLE
vech([1 0.5; 0.5 2]')
This example gives the matrix:
! 1. !
! .5 !
! 2. !
AUTHOR
Eric Dubois 2002