adding matrices inside cell array

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Franco
Franco 2011-2-10
how does one add all of the matrices stores in a cell array?
  1 个评论
Oleg Komarov
Oleg Komarov 2011-2-10
Be more specific, what do you intend by add the matrices? (take the sum of each single matrix, sum elementwise all the matrixes, all the single matrix sums are added together?

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vish
vish 2011-2-10
a={[1,2;3,4],[1,2;3,4];[1,2;3,4],[1,2;3,4]}
a{1}+a{2}+a{3}+a{4}
If there are many elements, use two for loops and run all the positions one by one using the equation c=a{i,j} + a{i+1,j+1}.

更多回答（1 个）

Oleg Komarov
Oleg Komarov 2011-2-10
An example:
% Create dummy input
c = {[1 2; 3 4], [3 3; 1 1]}
c =
[2x2 double] [2x2 double]
% Elementwise sum across matrices (only if ALL matrices have same size)
sum(cat(3,c{:}),3)
ans =
4 5
4 5
% Total sum of each matrix
cellfun(@(x)sum(x(:)),c,'un',0)
ans =
[10] [8]
% Grand sum
c = cellfun(@(x) x(:),c,'un',0);
sum(cat(1,c{:}))
ans =
18
Oleg
  1 个评论
Mariacarla Memeo
Mariacarla Memeo 2011-9-30
Excuse me Oleg,
can you explain your solution for the first case(sum of each element of matrices), because I have to sum 72 matrices [25x25] placed in a cell array [72x1] and I've no idea to how set your solution in my example. Please.

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