From help-request at octave dot org Fri May 20 09:35:33 2005
Subject: [octave] file i/o performance
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Mark Robinson <mrobinson at wehi dot edu dot au>
Cc: help at octave dot org
Date: Fri, 20 May 2005 10:31:00 -0400

On 20-May-2005, Mark Robinson wrote:

| Hi.  Newbie question.
| 
| I'm a new user of octave (using 2.1.62 on Mac OS X).  I'm trying to 
| port over some MATLAB code and am finding reading a text file 
| considerably slower in octave than in MATLAB 7.0.  Like, about 5 times 
| slower, which seems to me like it is not an artifact of octave ... it's 
| probably the code.
| 
| Basically, the program makes a bunch of 'fgetl' calls and, depending on 
| the content of the line (where it uses 'strrep' or 'strtok'), sticks it 
| in one of two cell arrays.  Are any of these known to be slower in 
| octave, or is there something to do with cell arrays that I should know 
| about?
| 
| It's actually a FASTA-formatted file for protein/DNA sequences.

If you think there is a bug in Octave, then please send a *complete*
bug report to the bug at octave dot org list.  If you're not sure what to
include in the report so that someone might actually be able to help
you solve the problem, then please read
http://www.octave.org/bugs.html before sending your report.

It seems unlikely to me that anyone will be able to help you if you
if all you provide is a complaint about performance and a vague
description of your code.

jwe



-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------