All combination for a cell structure?

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Xiaohan Du 2016-9-26

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评论： Andrei Bobrov 2016-9-26

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Hi all,

I'd like to get all combinations for all elements in a cell structure. For example,

var = rand(20, 3);
no = 5;
numcell = mat2cell(var, size(var, 1)/no*ones(1, no), ones(1, 3));

result in a 5 by 3 cell 'numcell' which contains 4 by 1 double for each cell.

I'd like to find all combinations among 5 by 3 'numcell', performing the calculation numcell{:}*numcell{:}' for each cell element of numcell. So that I'll get all permutation and combination of numcell{i}'*numcell{j}.

Thanks!

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Stephen23 2016-9-26

Continuation of this question:

http://www.mathworks.com/matlabcentral/answers/304204-all-combinations-of-matrix-elements

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Andrei Bobrov 2016-9-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/304525-all-combination-for-a-cell-structure#answer_236139

编辑：Andrei Bobrov 2016-9-26

在 MATLAB Online 中打开

I correctly understand:

out = cellfun(@(x)a(:).'*a(:),numcell);

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Stephen23 2016-9-26

编辑：Stephen23 2016-9-26

@Xiaohan Du: so what is the point in converting the data to a cell array, when the first step when performing this calculation is to get all the numeric arrays out of the cell array and concatenate them together?

Why bother with the cell array at all, when you don't use it for anything?