From help-octave-request at bevo dot che dot wisc dot edu  Mon Dec  6 14:06:25 1999
Subject: LU decomposition/backsubstitution
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Thomas Hoffmann <hoffmann at ehmgs2 dot et dot tu-dresden dot de>
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Mon, 6 Dec 1999 14:06:02 -0600 (CST)

On  6-Dec-1999, Thomas Hoffmann <hoffmann at ehmgs2 dot et dot tu-dresden dot de> wrote:

| 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?

No, not yet.  Would someone like to volunteer to implement this
feature for Octave and contribute the changes?

Thanks,

jwe



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