Retrieving Arrays

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RDG
RDG 2011-10-29
Suppose I have 4 cell arrays with 4 matrices in each cell array;
A{1}=[1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4; 4 8 12 16]
A{2}=[2 3 4 5; 2 3 4 5; 2 3 4 5; 2 3 4 5; 8 12 16 25]
A{3}=[3 4 5 6; 3 4 5 6; 3 4 5 6; 3 4 5 6; 12 16 25 24]
A{4}=[4 5 6 7; 4 5 6 7; 4 5 6 7; 4 5 6 7; 16 20 24 28]
I would like to retrieve 2 (of the best) cells according to the content of the matrices in [5,4] (notice that they're the summation of the elements above them). Let's just say I want to retrieve the matrices whose value of the [5,4] is closer to 0, it means that I will have A{1} and A{2} as my result.
May I know how to get about this?
  2 个评论
Fangjun Jiang
Fangjun Jiang 2011-10-29
Is the matrix in each cell always the same size? The last element of A{2} should be 20. It shouldn't matter but your expect result will be different.
RDG
RDG 2011-11-3
It's my mistake. It doesn't really affect my result. Thanks.

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Fangjun Jiang
Fangjun Jiang 2011-10-29
A{1}=[1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4; 4 8 12 16];
A{2}=[2 3 4 5; 2 3 4 5; 2 3 4 5; 2 3 4 5; 8 12 16 25];
A{3}=[3 4 5 6; 3 4 5 6; 3 4 5 6; 3 4 5 6; 12 16 25 24];
A{4}=[4 5 6 7; 4 5 6 7; 4 5 6 7; 4 5 6 7; 16 20 24 28];
B=cell2mat(A);
[m,n]=size(A{1});
b=B(m,n*(1:n));
[b,ind]=sort(abs(b));
ind=ind(1:2);
SelectA=A(ind);
celldisp(SelectA);
  3 个评论
显示 1更早的评论
Andrei Bobrov
Andrei Bobrov 2011-10-29
[ign,i1] = sort(cellfun(@(x)x(numel(x)),A))
out=A(i1(1:2))
RDG
RDG 2011-10-29
Splendid!

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