[Octave-bug-tracker] [bug #51728] del2 fails on 1-D input with a vector as spacing

[Roger Jeurissen]

Follow-up Comment #3, bug #51728 (project octave):

The Matlab documentation for del2 is indeed incorrect here. I said that the
example code that I gave works in Matlab, because it came directly from the
example on the Mathworks website. I assume that they checked their examples. I
don't have access to Matlab right now.

Your suggestion of supplying a spacing for the y-direction is actually much
simpler than what I proposed. I assumed that that wouldn't work because the
doc says:

At least 3 data points are needed for each dimension.

This solution relies on what happens when there are fewer than 3 data points;
that dimension is ignored, so it works. This could be implemented by adding
this right after line 80 ( which is h = varargin{1}; )


if(nd==2&&xor(sz(1)==1,sz(2)==1)&&xor(sz(1)>1,sz(2)>1))
  h_new{sz>1}=1;
  h_new{sz==1}=h;
  D=del2(M,h_new{:});
  return
endif


I just noticed that circshift has the same issue.

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