About interpolation of two-dimensional matrix question

Question

min wong 2016-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/316601-about-interpolation-of-two-dimensional-matrix-question

编辑： Walter Roberson 2016-12-13

采纳的回答： KSSV

在 MATLAB Online 中打开

My matrix

A=[12 3 65,2 3 6,68 15 40,66 98 12]

A is 3*4

x=[19 20 21]

x is 1*3

y=[118 119 120 121]

y is 1*4

zz=interp2(x,y,A,xlat,xlon,'cubic'); xlat=12*21 ,xlon=12*21

but it shows error

Error using griddedInterpolant
The grid vectors do not define a grid of points that match the given values.
Error in interp2>makegriddedinterp (line 228)
    F = griddedInterpolant(varargin{:});
Error in interp2 (line 128)
        F = makegriddedinterp({X, Y}, V, method,extrap);

How can fix it?

thanks

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Answer 1

KSSV 2016-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/316601-about-interpolation-of-two-dimensional-matrix-question#answer_246981

在 MATLAB Online 中打开

Try this....I think your A is not a matrix, it is a array, so error popped out.

clc; clear all ;
A = [12 3 65 ; 2 3 6 ;68 15 40 ;66 98 12] ;
x=[19 20 21]; 
y=[118 119 120 121] ;
xlat=12*21 ;xlon=12*21 ;
zz=interp2(x,y,A,xlat,xlon,'cubic');