Retrieving Arrays

Question

RDG 2011-10-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/19739-retrieving-arrays

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?

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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 2011-11-3

It's my mistake. It doesn't really affect my result. Thanks.

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Answer 1

Fangjun Jiang 2011-10-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/19739-retrieving-arrays#answer_26094

在 MATLAB Online 中打开

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);