Why is CELLFUN(@isempty) much slower than CELLFUN('isempty')?

2019 2 22
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更新时间：2019 2 22
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The title says it all. Example code:
x=cell(10000000, 1);
x(1980) = {1};
tic; find(~cellfun(@isempty, x)); toc
Elapsed time is 9.189388 seconds.
tic; find(~cellfun('isempty', x)); toc
Elapsed time is 0.061950 seconds.

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