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Use of CELLFUN instead of FOR loop

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Neil
Neil 2013-6-9
I have a 21x40 cell array with each cell containing a vector of variable length. I want to merge all of the cells in each column. I can achieve this using a FOR loop such as
A = 21x40 cell array
for n = 1:40
merge = cat(2,A{:,n})
end
How can I do this with, for example, CELLFUN or in some other way without using a FOR loop? Thanks a lot for any help.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-9
编辑：Azzi Abdelmalek 2013-6-9
A=num2cell(rand(21,40)) % Example
out=arrayfun(@(x) cat(2,A{:,x}),1:size(A,2),'un',0)
  2 个评论
Neil
Neil 2013-6-10
Thanks! I tried something similar with cellfun but that didn't work.
Jan
Jan 2013-6-10
This is a fast and short method. The "merge{n}= cat(2,A{:,n})" approach inside a loop is 50% faster.

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-9
for n = 1:40
merge = cat(2,A{:,n})
end
is the same then
merge = cat(2,A{:,40})
  4 个评论
显示 2更早的评论
Neil
Neil 2013-6-9
The for loop in my code does this on a per column basis. As I understand your code it only works on a single column. Am I missing something about your code?
Azzi Abdelmalek
Azzi Abdelmalek 2013-6-9
编辑：Azzi Abdelmalek 2013-6-9
Your for loop should be: (merge{n} instead of merge)
for n = 1:40
merge{n}= cat(2,A{:,n})
end

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