how to arrange an array elemets to unique pairs?

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vx2008 2015-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/261565-how-to-arrange-an-array-elemets-to-unique-pairs

评论： vx2008 2015-12-25

采纳的回答： Azzi Abdelmalek

for example, X={'a1', 'b2', 'c3', 'd4'};

I want to rearrange X as below:

A={'a1'; 'a1'; 'a1'; 'b2';'b2'; 'c3' } B={'b2'; 'c3'; 'd4' ;'c3';'d4';'d4'}

that means A, B:

'a1' 'b2'

'a1' 'c3'

'a1' 'd4'

'b2' 'c3'

'b2' 'd4'

'c3' 'd4'

Then how to get A and B according to X?

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Answer 1

Azzi Abdelmalek 2015-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/261565-how-to-arrange-an-array-elemets-to-unique-pairs#answer_204212

编辑：Azzi Abdelmalek 2015-12-24

在 MATLAB Online 中打开

X={'a1', 'b2', 'c3', 'd4'};
ii=1:numel(X)
jj=nchoosek(ii,2)
A=X(jj(:,1))'
B=X(jj(:,2))'

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Answer 2

Image Analyst 2015-12-24

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在 MATLAB Online 中打开

It sounds like you want to generate A and B from X, rather than take an existing A and B and stitch them together horizontally like you'd do with C=[A,B].

But I can't figure out any general rule for generating A and B except to just manually do it from individual elements:

% This is what we're starting with:
X={'a1', 'b2', 'c3', 'd4'}
% This is what we want to generate
% A={'a1'; 'a1'; 'a1'; 'b2';'b2'; 'c3' } 
% B={'b2'; 'c3'; 'd4' ;'c3';'d4';'d4'}
% Now, create A
A = [X(1); X(1); X(1); X(2); X(2); X(3)]
% Now, create B
B = [X(2); X(3); X(4); X(3); X(4); X(4)]

And you get A and B from X just like you wanted:

A = 
    'a1'
    'a1'
    'a1'
    'b2'
    'b2'
    'c3'
B = 
    'b2'
    'c3'
    'd4'
    'c3'
    'd4'
    'd4'

If you want it generalized to some different number of strings (rows), then you'll need to fill us in on what the rule for creating the order is, because I can't figure out any general rule. And, of course the rule for generating A is different than the rule for generating B so we'd need both rules.