extract portion of each cell array elements using cellfun

Question

Katherine Zheng 2022-7-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1764725-extract-portion-of-each-cell-array-elements-using-cellfun

评论： Katherine Zheng 2022-7-21

I have a 5x9 cell array A. Each cell in A contains a 3x1 cell. In each cells, I have mesh data for a surface. For example A{1,1} have three 119x755 matrix in each cell. But the mesh matrix size in A{1,2} are not in the same size of A{1,1}. I want to make the mesh size all the same in each cell array for example 100x700. How can I do it using cellfun?

A =

3x1 cell 3x1 cell 3x1 cell 3x1 cell 3x1 cell 3x1 cell 3x1 cell 3x1 cell 3x1 cell

A{1,1} =

119x755 double

A{1,2} =

122x764 double

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Walter Roberson 2022-7-20

Do you want to pick the first 100 x 700 entries, throwing away the information in the remaining rows and columns?

Or do you want to interpolate the data down, such as doing an imresize() operation on it?

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Answer 1

Walter Roberson 2022-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/1764725-extract-portion-of-each-cell-array-elements-using-cellfun#answer_1012085

在 MATLAB Online 中打开

newA = cellfun(@(C) cellfun(@(M) imresize(M, 100, 700), C, 'uniform', 0), A, 'uniform', 0);

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Walter Roberson 2022-7-21

在 MATLAB Online 中打开

A = {{zeros(128, 800);; zeros(128,800)}, {ones(150, 900); ones(150, 900)}};
newA = cellfun(@(C) cellfun(@(M) imresize(M, [100, 700]), C, 'uniform', 0), A, 'uniform', 0);
newA{1}
ans = 2×1 cell array
    {100×700 double}
    {100×700 double}

Katherine Zheng 2022-7-21

Hi @Walter Roberson, Thanks very much. That works like a charm. Can I ask an additional qustion? Is there any way to ultilise cellfun if I want to modify how many rows to be extracted in each cell column? For example, for first column A{:,1}, I want the matrix size to be 100x700. For second column A{:,2}, I want the matrix size to be 200x700. I have an array to store the size I want in B. Is this possible?

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