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[Octave-bug-tracker] [bug #33539] griddata does not support 'v4' method

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #33539] griddata does not support 'v4' method
Date: Tue, 10 Mar 2020 16:59:33 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36

Follow-up Comment #5, bug #33539 (project octave):

I think someone will have to implement this interpolation from the reference.
FWIW I did some searching and found an older cached copy of the griddata
documentation. The reference for the "v4" method is Sandwell, David T.,
"Biharmonic Spline Interpolation of GEOS-3 and SEASAT Altimeter Data",
Geophysical Research Letters, 2, 139-142,1987.

* https://topex.ucsd.edu/sandwell/publications/21.pdf

As an aside, tracing the historical record of Octave's griddata is a fun
exercise. It was originally added to Octave in 2007, a few months before
version 3.0.0 (https://hg.savannah.gnu.org/hgweb/octave/rev/9fddcc586065). It
was pulled from the Octave Forge geometry functions. And the original version
of that function was written between 1999-2001, the initial version is here


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