Choosing specific column within cells

Question

Yaashiene Pukazhendi 2023-3-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1933665-choosing-specific-column-within-cells

编辑： Stephen23 2023-3-22

Hi.

I have a 1x50 cell and each of the cells contain varying size of matrices. I would like to choose specific columns in each of the cell and place those columns into a separate function. How would I go about doing this? I have included my code for reference

for k = 1:numel(C)

F = fullfile(P,C(k).name); % P refers to the filepath and C are the chosen files within the filepath

C(k).data = readmatrix(F);

Ccell = {C.data};

cycle = Ccell(2:51); % I only want to choose C files from C(2) to C(51)

end

for i=1:50

cellV{i}= cycle{1,:}(:,16:25);

% Within these 50 C files(now in cell format), I would like to pick columns 16:25 from each C cell and place them into a function called cellV

end

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Stephen23 2023-3-22

编辑：Stephen23 2023-3-22

Move these two lines after the loop (there is no point in running them on every loop iteration, because your code anyway only keeps the last iteration's results, and discards all the previous iterations' results):

Ccell = {C.data};
cycle = Ccell(2:51);

Note that you can also use indexing directly in the comma-separated list, i.e. you can replace both of those lines with this:

cycle = {C(2:25).data};

Read more: https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

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Answer 1

Stephen23 2023-3-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1933665-choosing-specific-column-within-cells#answer_1198735

Why not just use the same loop? There does not seem to be any point in using a second loop.

for k = 1:numel(C)
    F = fullfile(P,C(k).name); % P refers to the filepath and C are the chosen files within the filepath
    M = readmatrix(F);
    C(k).data = M(:,16:25);
end
Ccell = {C(2:end).data} % optional