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How to do 2D array interpolation

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Pranjal Pathak
Pranjal Pathak on 26 May 2013
Edited: Bruno Luong on 13 Sep 2019
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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Answers (1)

Matt J
Matt J on 26 May 2013
x=linspace(1,4,1024);
F=griddedInterpolant(A);
result=F({x,x});

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Walter Roberson
Walter Roberson on 13 Sep 2019
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 on 13 Sep 2019
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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