Use of CELLFUN instead of FOR loop

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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.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 9 Jun 2013
Edited: Azzi Abdelmalek on 9 Jun 2013
A=num2cell(rand(21,40)) % Example
out=arrayfun(@(x) cat(2,A{:,x}),1:size(A,2),'un',0)
  2 Comments
Jan
Jan on 10 Jun 2013
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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More Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 9 Jun 2013
for n = 1:40
merge = cat(2,A{:,n})
end
is the same then
merge = cat(2,A{:,40})
  4 Comments
Azzi Abdelmalek
Azzi Abdelmalek on 9 Jun 2013
Edited: Azzi Abdelmalek on 9 Jun 2013
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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