[Octave-bug-tracker] [bug #32040] ppval fails after use of fnder

[John W. Eaton]

Follow-up Comment #2, bug #32040 (project octave):

It appears the Matlab spline and fnder functions create structures with the
fields 'form', 'breaks', 'coefs', 'pieces', 'order', and 'dim', but Octave
produces structures with the fields 'x', 'd', 'P', and 'orient' (for both) and
also 'k' for fnder.  What's the reason for the difference?  Is this something
that we should try to fix before the release?  I imagine someone somewhere
depending on these fieldnames, so they might as well be the same...

Also, it seems the orientation of the P field has changed.  For the example
below, pp.P is 1x9x4 now, but in 3.2.4 it is 9x4.  Why has this changed?  In
Matlab, it is apparently 9x4 (and called coefs instead of P).

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