How can I access element with same index from multiple cells

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Hu
Hu 2013-10-21
评论： Cedric 2013-10-21
For example, we have
a = cell(2,2);
a{1} = 1:4;
a{2} = 1:4;
a{3} = 1:4;
a{4} = 1:4;
How can we access like
a{:}(1)
to extract all first elements in cells a ?

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采纳的回答

Cedric
Cedric 2013-10-21
编辑：Cedric 2013-10-21
>> extract = @(C, k) cellfun(@(c)c(k), C) ;
>> extract(a, 1)
ans =
1 1
1 1
>> extract(a, 3)
ans =
3 3
3 3
if you want to make a lightweight function for extracting various elements of various cell arrays, or simply
>> cellfun(@(c)c(1), a)
ans =
1 1
1 1
if it is just for cell array a and you are fine with hard coding the element # in the expression.

更多回答（1 个）

Arturo Moncada-Torres
I suggest you to use cellfun, which applies a function to each element of a cell array. In your case, it would be something like this:
% Original cell.
a = cell(2,2);
a{1} = 1:4;
a{2} = 1:4;
a{3} = 1:4;
a{4} = 1:4;
% Choose element to extract.
elementToExtract = 1;
% Actually extract the chosen element of all the cells in a.
cellfun(@(x) x(elementToExtract ), a)
Hope it helps.

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