[Octave-bug-tracker] [bug #43586] control package: tf function outputs wrong results

[Mike Miller]

Update of bug #43586 (project octave):

                  Status:                    None => Need Info              
        Operating System:       Microsoft Windows => Any                    
                 Summary: tf function outputs wrong results => control
package: tf function outputs wrong results

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Follow-up Comment #3:

I think it would be useful to get someone to show what Matlab does with


s=tf('s')
s=tf('string')
s=tf('1/(s+1)')
s=tf('a')


According to http://www.mathworks.com/help/control/ref/tf.html, the  tf object
Variable property is allowed to be one of the strings 's', 'z', 'p', 'q',
'z^-1', or 'q^-1', but it doesn't say what Matlab does if you try to use a
different string.

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