Combination of 4 Element

Question

Machmud Roby Alhamidi 2019-10-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486505-combination-of-4-element

编辑： Andrei Bobrov 2019-10-22

采纳的回答： Jos (10584)

How do i put this to the simple way?

bl is a cell contained one or two elements

a1 = cell2mat(bl(1));

a2 = cell2mat(bl(2));

a3 = cell2mat([bl(1) bl(2)]);

a4 = cell2mat(bl(3));

a5 = cell2mat([bl(1) bl(3)]);

a6 = cell2mat([bl(2) bl(3)]);

a7 = cell2mat([bl(1) bl(2) bl(3)]);

a8 = cell2mat(bl(4));

a9 = cell2mat([bl(1) bl(4)]);

a10 = cell2mat([bl(2) bl(4)]);

a11 = cell2mat([bl(1) bl(2) bl(4)]);

a12 = cell2mat([bl(3) bl(4)]);

a13 = cell2mat([bl(1) bl(3) bl(4)]);

a14 = cell2mat([bl(2) bl(3) bl(4)]);

a15 = cell2mat([bl(1) bl(2) bl(3) bl(4)]);

i tried using

for i=1:4

a{i}=combnk(bl,i);

end

but end up with cell in cell element, and it is hard to access.

thank you.

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Answer 1

Jos (10584) 2019-10-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486505-combination-of-4-element#answer_397410

在 MATLAB Online 中打开

I make use of my function NCHOOSE, available here:

https://www.mathworks.com/matlabcentral/fileexchange/20011-nchoose

% bl is a cell array with four elements, each cell has 1 or 2 elements.
bl = {1 , [2 3], 4, [5 6]} 
bi = nchoose(1:numel(bl)) 
a = cellfun(@(k) [bl{k}], bi, 'un', 0 )

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Machmud Roby Alhamidi 2019-10-22

wow, this is works

thank you

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Answer 2

Andrei Bobrov 2019-10-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486505-combination-of-4-element#answer_397360

编辑：Andrei Bobrov 2019-10-22

在 MATLAB Online 中打开

bl = cellfun(@(x)x(:)',bl,'un',0);
n = numel(bl);
ii = cell(n,1);
for i = 1:n
    ii{i} = num2cell(nchoosek(1:4,i),2); 
end
a = cellfun(@(x)[bl{x}],cat(1,ii{:}),'un',0);