Curvilinear and interpolate

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2 total messages Started by Michael K Patterson Mon, 27 Jul 1992 18:46

#57

Author: Michael K Patterson
Date: Mon, 27 Jul 1992 18:46

15 lines
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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)

Re: Curvilinear and interpolate

#60

Author: Gary L Snethen
Date: Tue, 28 Jul 1992 00:19

34 lines
1696 bytes

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

;)

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