Applying functions to each cell in a cell array

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Benedict Low 2017-8-4

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评论： Benedict Low 2017-8-6

Good afternoon,

I have a 60 by 1 cell array that stores matrices of different sizes (all numeric). I want to perform certain functions (mean, diff, hypot, convhull...etc) on these matrices from the 1st element of the cell array, to the 60th element.

Is there a way I can do that?

Thank you.

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Jan 2017-8-4

Did you read the answers, which have been given already?

Benedict Low 2017-8-6

Yes I did Jan. But ran into errors. Trying to fix them now.

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Answer 1

the cyclist 2017-8-4

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编辑：the cyclist 2017-8-4

cellfun does exactly this.

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Answer 2

Moses Wayne 2017-8-4

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在 MATLAB Online 中打开

The function call "cellfun" is a useful function in this case. In the case of the function mean, the code below would work to get the mean of each subset within the cell array:

myCell = {[0 1 2]; [3 4 5]; [6 7 8]; [9 10 11]}
result = cellfun(@mean,myCell)

In this case, result would be an array of values [1 4 7 10]. I've linked the documentation to "cellfun" here.

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Answer 3

Adam 2017-8-4

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If you have multiple functions to perform a for loop would likely be simplest. The idea that for loops are very slow in Matlab is often erroneous. I favour cellfun and arrayfun from an aesthetic perspective, but from a speed perspective for loops are usually faster. And certainly if you want to calculate multiple things then a single pass over the data in a for loop is a lot better than multiple calls to cellfun, though you could of course create a composite function that will calculate all your results on a single cell and then call this via cellfun if you prefer the cellfun approach.