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How to do 2D array interpolation

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Pranjal Pathak
Pranjal Pathak 2013-5-26
编辑： Bruno Luong 2019-9-13
Hi, I have a 2d array of values of dimension 4x4, and I would like to do a bilinear interpolation upto a dimension of 1024x1024. I would be very grateful, if anyone helps me in this regard.
The 2d array is:
A=[0.0169 0.5876 0.4689 1.0000;
0.5989 0.6525 0.3475 0.3559;
0.5706 0.6525 0.3814 0.3616;
0 0.5537 0.4011 0.8644];
Thanking You!

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回答（1 个）

Matt J
Matt J 2013-5-26
x=linspace(1,4,1024);
F=griddedInterpolant(A);
result=F({x,x});
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Walter Roberson
Walter Roberson 2019-9-13
griddedInterpolant() itself needs at least R2011b.
In particularly old versions of MATLAB it might be necessary to use meshgrid() to construct the arrays of query locations.
[X, Y] = meshgrid(x, x);
result = interp2(A, X, Y);
Bruno Luong
Bruno Luong 2019-9-13
编辑：Bruno Luong 2019-9-13
Yes. Quite obscure, it took me few seconds to figure it out Matt's compact code, but it works
x = linspace(1,4,1024);
result = interp2(A,x(:),x)

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