From bug-octave-request at bevo dot che dot wisc dot edu  Fri Jun  8 16:36:27 2001
Subject: Three problems
From: Wayne Krug <patton3 at bellsouth dot net>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Fri, 08 Jun 2001 17:29:30 -0400

Bug report for Octave 2.1.31, Windows version

Problem 1:

The functions rlocus.m and sys2zp.m from the controls group give the
following warning:

warning: empty matrix found in matrix list near line 48, column 49

sys2zp.m gives two occurrences of this warning; rlocus.m gives at least
four dozen.  I've poked around a bit myself and figured out that the
problem is not in either of the function files.

Problem 2:

Again in rlocus.m, when trying to plot the root locus of the function 1
/ s + 1, rlocus returns the following set of warnings and errors:

warning: empty matrix found in matrix list near line 48, column 49
warning: empty matrix found in matrix list near line 48, column 49
warning: empty matrix found in matrix list near line 185, column 15
warning: empty matrix found in matrix list near line 185, column 33
warning: empty matrix found in matrix list
error: invalid vector index = 2
error: evaluating assignment expression near line 43, column 9
error: called from `axis2dlim' in file
`/usr/local/share/octave/2.1.31/m/control/util/axis2dlim.m'
error: called from `rlocus' in file
`/usr/local/share/octave/2.1.31/m/control/base/rlocus.m'

So far, this has only occurred when using that particular transfer
function.

Problem 3:

Bug_report.m does not work.  It cannot find any of the binary utilities
(grep, cat, rm, etc) or Emacs.  However, I can access these programs
from the DOS shell without any problems.



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