Removing elements from a cell array... Loop index issue

Question

Alex 2011-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/3440-removing-elements-from-a-cell-array-loop-index-issue

Hi, I want to loop through the elements of a cell array and remove elements that do not satisfy a size requirement. I'm getting an issue where the loop index points to non-existent elements as a result of this removal.

How can I get around this? Is there a more elegant MATLAB way to solve this problem?

Summary: d1 is a cell array in which each element is a 1xN array of doubles. I want to remove the elements that do not satisfy a specific size requirement (in this case if the length is not equal to patch^2).

for i = 1:length(d1) if length(d1{i}) ~= patch^2 d1(i) = []; end end

Thanks for your help.

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Answer 1

Walter Roberson 2011-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/3440-removing-elements-from-a-cell-array-loop-index-issue#answer_5056

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Either loop backwards or do them all at once.

for i = length(d1):-1:1; if length(d1{i}) ~= patch^2; d1(i) = []; end end

OR

d1(cellfun(@length, d1) ~= patch^2) = [];

By the way, it is not advisable to use "patch" as a variable name, as it is the name of an often-used function. "i" is not recommended as a variable name either, as it is pre-defined as sqrt(-1)