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

[Marco Caliari]

Follow-up Comment #7, bug #31352 (project octave):

Dear all,

I'm attaching my new versions of interp2.m and bicubic.m. Comments:

1) bicubic supports meshgridded X,Y, extrapval and spline_alpha (now called
a)
2) for the cubic interpolation, interp2 does the following:
X and Y must be vectors of the same length or meshgridded
XI and YI vectors of different orientation (or meshgridded) or scattered
(same dimensions)

if (X and Y not equispaced)
  if (XI and YI meshgridded)
    __splinen__
  else
    direct spline
  endif
else
  bicubic
endif
3) all the testcases suggested by Gunnar (and included in interp2.m) now
pass, with some small modifications in the tolerance or in the orientation of
the result (now the orientation is ml compatible).
4) Documentation could be improved.

Please check.

Marco

(file #21807, file #21808)
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Additional Item Attachment:

File name: bicubic.m                      Size:3 KB
File name: interp2.m                      Size:19 KB


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