From bug-request at octave dot org Wed Sep 15 02:23:32 2004
Subject: Octave Bug
From: Gabriele Pannocchia <g dot pannocchia at cpclab dot ing dot unipi dot it>
To: B J <top_gun_canada at yahoo dot com>
Cc: bug-octave at bevo dot che dot wisc dot edu
Date: Wed, 15 Sep 2004 02:20:28 -0500

 Hi,

 This is not an Octave bug. As far as I know, tf2sys(num,den) is
 implemented for scalar systems only. Therefore (num,den) must be
 vectors of coefficients. In your example, "a" is matrix and "b" is a
 vector. 
 
 Cheers,
	Gabriele

 PS. Currently, the use of tf2sys is depracated. tf() is the current
 function to use.

 > I just tried running an example from the Octave
 > control systems page and it crashed.  The following is
 > what I had:
 > 
 > octave:1> a = [1 -2; -1.1 -2.1];
 > octave:2> b = [1; 2; 1];
 > octave:3> sys = tf2sys(a, b)
 > error: num (2x2) and den (3x1) must be vectors
 > error: evaluating if command near line 69, column 3
 > error: called from `tf2sys' in file
 > `/sw/share/octave/2.1.53/m/control/system/tf2sys.m'
 > error: evaluating assignment expression near line 3,
 > column 5
 > 
 > I've tried numerous other examples from that same
 > section and had similar results.
 > 
 > I'm using Octave 2.1.53 for Darwin, which is the
 > current stable version on Fink.
 > 
 > Please advise.  Thanks.
 > 
 > B. M. Jatzeck
 > 
 > 
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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
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