Variable for loop storage

Question

Cside 2020-8-3

0
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https://ww2.mathworks.cn/matlabcentral/answers/574273-variable-for-loop-storage

回答： madhan ravi 2020-8-3

Hi, I currently have this code which allows the for loop to run based off an array, but I cannot run the same for loop to create a new matrix (the size of the matrix should be the number of loops run). Is there a way I can code for this better? Thank you!

lowPs = 50 x 1 array [101,105,107....], variable pattern

A is a 170 x 50 matrix

for k = lowPs(1:end)
    B = find(A(:,1) == k)); %%row numbers in A where A(:,1) that contain the integer in lowPs
    low = A(B,:); %% extract these rows from A and build it into a new matrix low, low should be 50 x50
end

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Answer 1

madhan ravi 2020-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/574273-variable-for-loop-storage#answer_474349

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 low = cell(numel(lowPs), 1);
 for k = 1 : numel(lowPs)
     B = A(:,1) == lowPs(k); %%row numbers in A where A(:,1) that contain the integer in lowPs
     low{k} = A(B, :); %%extract these rows from A and build it into a new matrix low, low should be 50 x50
 end
 low = cat(1, low{:});