[Octave-bug-tracker] [bug #56665] Incorrect results with ppval and interp1 when using complex query points

[Marco Caliari]

Update of bug #56665 (project octave):

              Item Group:        Incorrect Result => Feature Request        

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Follow-up Comment #4:

The result of interp1 is not a differentiable function. You should not ask for
the derivative between consecutive intervals. A part from those points, it is
a polynomial which is safe to evaluate at complex points, with the note that
the interval of reference is chosen according to the real part of the query
point.

I think that the hints in the original submission should fix the problems
there observed.

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