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Constructor for LU: why dgesv?

From: Thomas Hoffmann
Subject: Constructor for LU: why dgesv?
Date: Wed, 8 Dec 1999 10:07:39 +0100 (MET)

Excuse my ignorance, but when looking into the ctor for LU (e.g.,
I noticed that octave calls the Fortran subroutine dgesv, with a second 
(NRHS) of 0. 

dgesv calls in turn DGETRF (factorization) and DGETRS (solution). 

But if one uses NRHS=0, DGETRS only checks some parameters and returns.

Why does the ctor not call dgetrf directly, when only the factorization is 

Thomas Hoffmann.

Thomas Hoffmann, Institut fuer Halbleiter- und Mikrosystemtechnik, TU Dresden 
E-mail: address@hidden

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