[Octave-bug-tracker] [bug #51936] [octave forge] (signal) zp2sos wrong results for single zero

[Mike Miller]

Update of bug #51936 (project octave):

                Severity:              3 - Normal => 2 - Minor              
                  Status:                    None => Need Info              
                 Summary: zp2sos wrong results for single zero => [octave
forge] (signal) zp2sos wrong results for single zero

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Follow-up Comment #1:

Well let's look at the inverse operation:


[z, p, k] = sos2zp ([1 -1 0 1 0 -1])
z =

   1
   0

p =

  -1
   1

k =  1


This matches your third line. This implies that the zeros array may have been
padded.

And if you look into zp2sos.m, if the number of real zeros is not even, the z
array is padded by a single 0. This makes the first the same as the third.

What does Matlab do with these examples? What do you think the results should
be?

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