Applying functions to each cell in a cell array
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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.
3 个评论
Benedict Low
2017-8-4
编辑：Benedict Low
2017-8-4
Jan
2017-8-4
Did you read the answers, which have been given already?
Benedict Low
2017-8-6
采纳的回答
the cyclist
2017-8-4
编辑：the cyclist
2017-8-4
1 个投票
cellfun does exactly this.
更多回答（2 个）
Moses Wayne
2017-8-4
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.
Adam
2017-8-4
0 个投票
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.
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