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[Octave-bug-tracker] [bug #34334] symrcm order is not reversed
From: |
Jordi Gutiérrez Hermoso |
Subject: |
[Octave-bug-tracker] [bug #34334] symrcm order is not reversed |
Date: |
Mon, 19 Sep 2011 22:13:08 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20110109 Riverwolf/3.6.13 |
URL:
<http://savannah.gnu.org/bugs/?34334>
Summary: symrcm order is not reversed
Project: GNU Octave
Submitted by: None
Submitted on: Mon 19 Sep 2011 10:13:07 PM GMT
Category: None
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
the sparse matrix function symrcm appears to produce results in non-reversed
Cuthill-McKee ordering rather than reverse Cuthill-McKee (compare to MATLAB
symrcm with spy). This makes a big difference for FEM solution of
Navier-Stokes with Taylor-Hood elements via gmres (Octave 3.4.2) --
non-reversed ordering produces poor matrix conditioning, reverse ordering
works properly (verified in both MATLAB and Octave). Direct solutions
(mldivide) are not impacted however. Please update symrcm (possibly with
fliplr or flipud of the result).
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?34334>
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- [Octave-bug-tracker] [bug #34334] symrcm order is not reversed,
Jordi Gutiérrez Hermoso <=