rlocus help

[Shaun Jackman]

I'm trying to run:
        rlocus( tf2sys( [1], [1 1]))
and see a few errors (following this e-mail).
My version of octave is...
        GNU Octave, version 2.1.35 (i386-pc-linux-gnu)
        octave2.1      2.1.35-7woody1

To help people migrating from Matlab and help source compatibility, 
can an alias called tf for tf2sys be created?

Cheers,
Shaun


octave:1> rlocus( tf2sys( [1], [1 1]))
num = 1
den =

  1  1

warning: empty matrix found in matrix list near line 185, column 15
warning: in /usr/share/octave/2.1.35/m/control/base/rlocus.m near line 
185, column 12:

>>> axdata = [real (rlpolv (idx)), imag (rlpolv (idx))];


warning: empty matrix found in matrix list near line 185, column 33
warning: in /usr/share/octave/2.1.35/m/control/base/rlocus.m near line 
185, column 12:

>>> axdata = [real (rlpolv (idx)), imag (rlpolv (idx))];


warning: empty matrix found in matrix list
warning: in /usr/share/octave/2.1.35/m/control/base/rlocus.m near line 
185, column 12:

>>> axdata = [real (rlpolv (idx)), imag (rlpolv (idx))];


error: invalid vector index = 2
error: evaluating assignment expression near line 43, column 9
error: called from `axis2dlim' in file 
`/usr/share/octave/2.1.35/m/control/util/axis2dlim.m'
error: called from `rlocus' in file 
`/usr/share/octave/2.1.35/m/control/base/rlocus.m'



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