From help-octave-request at bevo dot che dot wisc dot edu  Mon Dec  6 04:15:16 1999
Subject: LU decomposition/backsubstitution
From: Thomas Hoffmann <hoffmann at ehmgs2 dot et dot tu-dresden dot de>
To: help-octave at bevo dot che dot wisc dot edu
Date: Mon, 6 Dec 1999 11:14:03 +0100 (MET)

To solve a linear system A x = b, I use "left division" x=A\b .

But given I have a system with fixed A and several (succesively computed)
b's, I would like to use something like a precomputed decomposition of A which I can apply my b's to, 
to get the solutions for every b with minimal computational effort.

Formerly I used RLab, where I had a function "backsub", which is an internal function derived from a 
LAPACK or LINPACK subroutine.

Is there a similar possibility in Octave?

Thomas.

=============================================================================
Thomas Hoffmann, Institut fuer Halbleiter- und Mikrosystemtechnik, TU Dresden 
E-mail: hoffmann at ehmgs2 dot et dot tu-dresden dot de



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