From bug-octave-request at bevo dot che dot wisc dot edu  Mon Jan 29 09:14:38 2001
Subject: SGI Irix 64.5, incorrect answers
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: geraint bevan <geraint dot p dot bevan dot itar at jsfmail dot p dot external dot lmco dot com>
Cc: bug-octave at bevo dot che dot wisc dot edu
Date: Mon, 29 Jan 2001 09:14:28 -0600

On 24-Jan-2001, geraint bevan <geraint dot p dot bevan dot itar at jsfmail dot p dot external dot lmco dot com> wrote:

| Bug report for Octave 2.1.33 configured for %OCTAVE_CANONICAL_HOST_TYPE%
| 
| Description:
| -----------
| 
| On an SGI Octane, with Irix64.5.4f and a newly compiled Octave 2.1.33,
| simple calculations are generating incorrect answers. It appears that the
| result of a previous calculation remains in memory and affects the answer
| of the current one.
| 
| Octave 2.0.14, on the same machine (compiled elsewhere) gives the correct
| answer.
| 
| I suspect that this is a problem with my particular system rather than a
| bug in Octave. Can anybody running a similar system confirm this please?
| If so, I would appreciate any thoughts on what might be causing this.
| 
| Geraint Bevan.
| 
| 
| Repeat-By:
| ---------
| 
| 	london$ octave << EOF
| 
| 	dummy = [ 3 , 4 ; 5 , 6 ]
| 
| 	# This should generate [ 1, 1 ; 1, 1 ] three times
| 
| 	x = [ 1 ; 1 ]
| 	y = [ 1 , 1 ]
| 	z = x * y
| 
| 	z = [ 1 ; 1 ] * [ 1 , 1 ]
| 
| 	x = [ 1 ; 1 ]
| 	y = [ 1 , 1 ]
| 	z = x * y
| 
| 	EOF
| 
| 
| 	GNU Octave, version 2.1.33 (mips-sgi-irix6.5).
| 	Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 John W. Eaton.
| 	This is free software with ABSOLUTELY NO WARRANTY.
| 	For details, type `warranty'.
| 
| 	*** This is a development version of Octave.  Development releases
| 	*** are provided for people who want to help test, debug, and improve
| 	*** Octave.
| 	***
| 	*** If you want a stable, well-tested version of Octave, you should be
| 	*** using one of the stable releases (when this development release
| 	*** was made, the latest stable version was 2.0.16).
| 
| 	dummy =
| 
| 	  3  4
| 	  5  6
| 
| 	x =
| 
| 	  1
| 	  1
| 
| 	y =
| 
| 	  1  1
| 
| 	z =
| 
| 	  0.00000  4.00000
| 	  5.00000  0.00000
| 
| 	z =
| 
| 	   6.4974e-231    0.0000e+00
| 	   2.6099e+154  0.00000e-316
| 
| 	x =
| 
| 	  1
| 	  1
| 
| 	y =
| 
| 	  1  1
| 
| 	z =
| 
| 	   6.4974e-231    0.0000e+00
| 	   2.6099e+154  0.00000e-316

Sorry, I can't reproduce this problem (but I don't have an SGI system
to use for debugging).  Can you please try to debug the problem?

jwe



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