# Householder matrices

• September 25th 2010, 02:43 PM
Random Variable
Householder matrices
I'm given a 3x1 Householder vector (u) and a 3x2 matrix (A). The problem asks to find both HA and AH (where H is the associated Householder matrix). But how does AH even exist? The associated Householder matrix is 3x3.
• September 27th 2010, 03:51 AM
HappyJoe
Quote:

Originally Posted by Random Variable
I'm given a 3x1 Householder vector (u) and a 3x2 matrix (A). The problem asks to find both HA and AH (where H is the associated Householder matrix). But how does AH even exist? The associated Householder matrix is 3x3.

I agree that it looks like a mistake. Perhaps it was meant to be $A^TH$.