[Octave-bug-tracker] [bug #43586] control package: tf function accepts any string as the variable name

[Mike Miller]

Update of bug #43586 (project octave):

                Severity:              3 - Normal => 2 - Minor              
                Priority:              5 - Normal => 3 - Low                
              Item Group:        Incorrect Result => Incorrect Documentation
                 Release:                   3.8.0 => other                  
                 Summary: control package: tf function outputs wrong results
=> control package: tf function accepts any string as the variable name

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Follow-up Comment #5:

So it looks like Matlab strictly validates the string given to the tf function
and it probably has to exactly match one of the allowed "variable" strings
's', 'z', 'p', 'q', 'z^-1', or 'q^-1'.

Since any other string is disallowed by Matlab, there's no harm in accepting
other strings in the control package for compatibility.

It's up the control package maintainer whether more strict checks should be
added for the variable name string, or whether it's documented clearly enough
as is.

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