how to arrange an array elemets to unique pairs?

1 回表示 (過去 30 日間)
vx2008
vx2008 2015 年 12 月 24 日
コメント済み: vx2008 2015 年 12 月 25 日
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?

採用された回答

Azzi Abdelmalek
Azzi Abdelmalek 2015 年 12 月 24 日
編集済み: Azzi Abdelmalek 2015 年 12 月 24 日
X={'a1', 'b2', 'c3', 'd4'};
ii=1:numel(X)
jj=nchoosek(ii,2)
A=X(jj(:,1))'
B=X(jj(:,2))'

その他の回答 (1 件)

Image Analyst
Image Analyst 2015 年 12 月 24 日
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.
  1 件のコメント
vx2008
vx2008 2015 年 12 月 25 日
Thank you for your reply.
We can use 'nchoosek' to do this work better.
Thank you at all.

サインインしてコメントする。

カテゴリ

Help Center および File ExchangeElementary Math についてさらに検索

タグ

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by