Matrix Decomposition

From: Ben (xxieca_at_hotmail.com)
Date: 03/15/05 

Date: 14 Mar 2005 20:56:45 -0800

Hi,

 We all know a matrix A can be decomposed into Q * R

where Q is an orthogonal matrix and R is a triangular matrix.

Any one know if we can find a decomposition Q * M for a matrix A,so

A = Q * M

where q is an orthogonal matrix and M is a positive definite symmetric matrix.

Under what condition, if any, we can find such a decomposition??

Your reply/comment will be hightly appreciated

Ben