[Octave-bug-tracker] [bug #31352] interp2 broken for non-quadratic matrices when using cubic interpolation

[Marco Caliari]

Follow-up Comment #11, bug #31352 (project octave):

Dear Thorsten,

thanks for all your useful comments.

(1) you are absolutely right about the relative test.
(2) that's the limit of my very simple implementation: it should be faster
(or much faster) for large x and y and not so large xi and yi, but more memory
consuming. I will think again about the implementation.
(3) the fourth case is fine with interp2 (x,y,B,xi',yi,'cubic') (lines 349++
in interp2.m), so easy to fix.
(4) Can you specify the values of xi and yi in the first two cases? The case
with large xi and yi is more efficient with the old code, this I already
observed. I will think again.

Thanks again,

Marco

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