Expanding a matrix using interpolation?
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Hi everyone,
I have a 7X5 matrix called "Temperatures", and I was wondering if I could interpolate these values it both directions to get a better 2D temperature gradient graph?
This are the values in my matrix:
And using ">> imagesc(Temperatures)" I get something like this
Is it possible to interpolate this matrix to obtain a better temperature gradient graph?
Thank you!
采纳的回答
John D'Errico
2018-4-29
编辑：John D'Errico
2018-4-29
Simplest is to use imresize. I assume it used to be in the image processing TB, but has migrated to MATLAB itself, due to the general utility of that function.
T = [ 300 300 300 300 300
300 346.3 358.9 346.3 300
300 363.8 380.5 363.8 300
300 356.8 373.2 356.8 300
300 363.8 380.5 363.8 300
300 346.3 358.9 346.3 300
300 300 300 300 300];
Tnew = imresize(T,30,'bilinear');
pcolor(Tnew)
shading interp
Given the coarse starting array, it does not merit more that that. Be careful with the bicubic option with imresize here.
Another option is to use interp2.
Tnew = interp2(T,5,'bicubic');
surf(Tnew)
shading interp
To be honest, your array may be far too coarse to merit that treatment.
更多回答（1 个）
Ameer Hamza
2018-4-29
编辑：Ameer Hamza
2018-4-29
newNumberOfRows = 10; % set the number of rows interpolated rows you want
newNumberOfCols = 5; % set the number of columns interpolated rows you want
[x, y] = meshgrid(1:size(A,2), 1:size(A,1));
[xq, yq] = meshgrid(linspace(1, size(A, 2), newNumberOfCols), linspace(1, size(A, 1), newNumberOfRows));
newMatrix = interp2(x, y, A, xq, yq)
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