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In <mikep.712262803@pv7b88.vincent.iastate.edu> mikep@iastate.edu (Michael K Patterson) writes:

>When I feed 2d curvilinear data and a GENLAT lattice into interpolate,
>many of my points are lost (become 0). Reading from the man page:

>     KNOWN PROBLEMS
>          For interpolation of a point lying outside of a curvilinear
>          Source, a zero value is returned without any indication that
>          the point lies outside the known grid.

>Hmmm. can someone tell me what's wrong, or what I'm missing, or if It's not
>me, what the problem is, so that I can work around it?


>Thanks
>------------Michael Patterson
>(mikep@iastate.edu)

Well Mike,

   It sounds to me as though there are some coordinates in your interpolation
lattice that lie outside your data's coordinates...  In order to be
interpolated, the point must lie within (ie., be surrounded by) your data.

Imagine a 1D interpolation...  if I said that at point 2 the value was 5
and at point 4 the value was 3, then you could interpolate for point 4 
(yielding a value of 3), but not at any points less than 2 or greater than 4.


Hope this helps (and is accurate...)

---Xeno

;)