interp2 problem: input grid is not a valid meshgrid

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Kim 2014-6-13

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评论： dpb 2014-6-13

I would like to interpolate, but I keep on getting the message: Error using interp2>makegriddedinterp (line 220) Input grid is not a valid MESHGRID.

Below is a simplified version of my data. Does anyone know how to solve this? Thank you!

Y=[30 29 27 20;32 31 29 22;35 34 32 25]
X=[0 2 5 10;0 2 5 10;0 2 5 10]
V=[1 2 3.5 4 ; 1.2 2.3 3.8 4.8; 1.4 2.6 4.2 5]
Yq=30
Xq=4

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dpb 2014-6-13

编辑：dpb 2014-6-13

Well, show what you did that raised the error and what you want. The round, translucent orb is somewhat murky today...

ADDENDUM

OK, I didn't look at the posted data closely enough first time -- from the doc for interp2 one finds--

... All the interpolation methods require that X and Y be monotonic and plaid (as if they were created using MESHGRID).

Your X data are monotonic ok, but they're not regular (plaid) as must be.

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Answer 1

dpb 2014-6-13

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编辑：dpb 2014-6-13

在 MATLAB Online 中打开

 As noted in the comment, your data set doesn't meet the requirements of *interp2* of a uniform mesh in both directions.  Use *TriScatteredInterp* instead...
>> F = TriScatteredInterp(X(:),Y(:),V(:));
>> F(Xq,Yq)
ans =
  3.3444
>>

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Matt J 2014-6-13

编辑：Matt J 2014-6-13

Time to upgrade! TriScatteredInterp will be removed eventually, see

http://www.mathworks.com/help/matlab/ref/triscatteredinterp.html

dpb 2014-6-13

R2012b has brung my machine to about all it can do even after adding all the memory it can hold. Since I've retired from consulting, not much incentive to spend $$ on all the things I've become accustomed to besides Matlab so I'll probably just stand pat until the machine dies. Then it'll be a hard decision...

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