removing element from all arrays in cell array of 1-dimensional arrays

Question

Kees Roos 2012-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/37401-removing-element-from-all-arrays-in-cell-array-of-1-dimensional-arrays

I have a cell array out = cell(n,1), and each out{j}, 1<= j <= n, is a vector of integers. These vectors have different lengths. How can I efficiently remove an integer k from all vectors containing k?

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Answer 1

Andrei Bobrov 2012-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/37401-removing-element-from-all-arrays-in-cell-array-of-1-dimensional-arrays#answer_46705

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newout = cellfun(@(x)setdiff(x,k),out,'un',0);

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Answer 2

Jan 2012-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/37401-removing-element-from-all-arrays-in-cell-array-of-1-dimensional-arrays#answer_46703

在 MATLAB Online 中打开

for i = 1:n
  v      = out{i};
  out{i} = v(v ~= k);
end

I assume 1. that a smarter cellfun approach is slower and 2. that spending more time for programming a faster solution (if there is any) will not pay off, except that this function is called trillions of times.

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Kees Roos 2012-5-4

Thanks! Your remark on cellfun turns out to be true. But in my case, where n=1000, the for loop takes also too much time. I was hoping for a 'vectorized' solution.

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