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Re: doubt in matrix_type help
From: |
David Bateman |
Subject: |
Re: doubt in matrix_type help |
Date: |
Tue, 19 Jul 2005 11:54:34 +0200 |
User-agent: |
Mozilla Thunderbird 0.8 (X11/20040923) |
Jorge Barros de Abreu wrote:
Hi for All.
Anyone, please, send to me tree matrices in a .m file of the type "banded" and
say to me what is "nl" and "nu" like in help file.
nl is the number of sub-diagonal bands and nu is the number of
super-diagonal bands.
And also a example of
"tridiagonal" matrix.
tridiagonal is a banded matrix where nl=nu=1, there are special routines
to treat this sub case in LAPACK which are faster, which is the sole
interest of making this distinction.
D.
--
David Bateman address@hidden
Motorola Labs - Paris +33 1 69 35 48 04 (Ph)
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