Bug 136787

Summary:	Octave fails to do matrix operations
Product:	[openSUSE] SUSE LINUX 10.0	Reporter:	Martin Vuk <mrcin.vuk>
Component:	ConsoleApps	Assignee:	Anna Maresova <anicka>
Status:	RESOLVED FIXED	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None	CC:	krienke
Version:	unspecified
Target Milestone:	---
Hardware:	i686
OS:	SuSE Linux 10.0
Whiteboard:
Found By:	Other	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Martin Vuk 2005-12-02 22:26:10 UTC

If I try to do some simple matrix operations like  A\b for 3x3 matrix, octave uses  99% of CPU and don't finish operation even after considerable time (5min). I also tried to compile it from source, but I get the same behavior. So the problem is probobaly due to one of the libraries on which octave depends(blas?).

octave ver 2.1.71-2
all the octave dependancies are up to date

Comment 1 Michael Gross 2005-12-05 17:08:38 UTC

Please provide some sort of a backtrace here and any considerable output that is shown. You might use gdb and/or ltrace/strace. Also: please show us the exact input you have used so the problem can be reproduced. Thanks.

Comment 2 Michael Gross 2005-12-12 15:26:38 UTC

If you can provide the information ask for, please do so and reopen this report. For now it gets closed as a reminder.

Comment 3 Rainer Krienke 2005-12-22 08:02:17 UTC

A user having the very same problem on his suse10 i586 machine gave me this code snipplet for octave that will let octave work for a very long time allthough its a very simple task.

octave -q
A = rand(3,3);  # erzeugt 3 x 3 Zufallsmatrix
D = det(A);     # Berechnet Determinante davon, dauert unter 10.0 ewig

This will take at least more than 30 sec (thats when I stopped it). I tested it also on a suse10.0 x86_64 machine and here it completes in 0.5 sec. On the i586 machine (P4 3Ghz) there is no output or error message.

Comment 4 Anna Maresova 2006-02-01 17:54:58 UTC

Fixed for 10.1.