Cell array: select only 1x3 double cells

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Riccardo Rossi
Riccardo Rossi 2019-1-15
评论： Guillaume 2019-1-15
Hi everyone,
i have a 1x4 cell array like this:
{[0.1]} {1×3 double} {[0.02]} {1×3 double}
and i want to extract only the 1x3 double cells (of which I do not know the exact location into cell array).
Thank's a lot!
Riccardo Rossi

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Stephen23
Stephen23 2019-1-15
编辑：Stephen23 2019-1-15
Where C is your cell array:
X = cellfun('length',C)==3;
out = C(X)
https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html
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Stephen23
Stephen23 2019-1-15
F = @(v)isnumeric(v)&&isrow(v)&&numel(v)==3;
X = cellfun(F,C);
out = C(X)
Guillaume
Guillaume 2019-1-15
So It should Be Faster Because There's No Overloading Involved?
It is faster because cellfun use a different algorithm when using the backward compatible syntax. The built-in code does not call any other function when iterating over the elements, it's got its own implementation of length.
One side effect of that is that if you've overloaded length for a type in the cell array, that overload won't get called. For that reason, I personally wouldn't recommend using the old syntax unless you're 100% certain that your cell array will never ever contain objects. There's a reason the old syntax has been deprecated.

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