Surface fitting for a matrix

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Keyla Gonzalez
Keyla Gonzalez 2020-5-7
评论： Ameer Hamza 2020-5-8
Hi,
Do you know how can I obtain surface fit (polynomial) for a matrix of size 20x20. I notice that in the curve fitting toolbox you need to enter your data as X and Y; however I'm not how to use it with a matrix of that size.
I also used imagesc to visualize my values however im not sure if I can do something with the image.

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-5-7
If you just have the matrix, then you can use the row and column number as the x and y variables. Try this example
M = ((1:10)+(1:10).').^2;
[X, Y] = meshgrid(1:size(M,2), 1:size(M,1));
fit_model = fit([X(:) Y(:)], M(:), 'poly43');
plot(fit_model, [X(:) Y(:)], M(:))

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