How to change sampling points and frequency of a matrix?

Question

Mirlan Karimov 2020-6-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/547725-how-to-change-sampling-points-and-frequency-of-a-matrix

评论： Mirlan Karimov 2020-6-16

采纳的回答： Ameer Hamza

I have a m x n grid X and another m x n matrix v with values corresponding to each grid point of X . I want:

1) resample X to make it m x m without changing the boundary values (i.e. max and min)

2) the interp v according to the new grid so that it is also m x m

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Answer 1

Ameer Hamza 2020-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/547725-how-to-change-sampling-points-and-frequency-of-a-matrix#answer_450876

在 MATLAB Online 中打开

Try something like this

m = 10;
n = 15;
x_range = [0 1];
y_range = [3 6];
[X, Y] = meshgrid(linspace(x_range(1), x_range(2), n), linspace(y_range(1), y_range(2), m));
Z = rand(size(X));
[X_new, Y_new] = meshgrid(linspace(x_range(1), x_range(2), m), linspace(y_range(1), y_range(2), m));
Z_new = interp2(X, Y, Z, X_new, Y_new);

X, Y, and Z old grid points having dimensions of m*n. X_new, Y_new, and Z_new and new grids of dimension m*m.

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Mirlan Karimov 2020-6-16

That was exactly what I had written but I had made a mistake way before this part, I later realized. Anyway, thank you for your answer. I will accept it as it is correct.

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