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could anyone tell me how to group the combinations under the condition that the same number should not be repeated again.

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Prabha Kumaresan
Prabha Kumaresan 2018-3-23
关闭： MATLAB Answer Bot 2021-8-20
code: c = combnk(1:4,2)
If i run it i am getting c =
3 4
2 4
2 3
1 4
1 3
1 2
could anyone help me how to group the numbers say for example (34,12),(24,13) and (23,14) in the following way.

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回答（2 个）

KSSV
KSSV 2018-3-23
c = combnk(1:4,2) ;
N = sum(c.*[10 1],2) ;
iwant = [N(1:3) N(length(N):-1:4)]
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Rik
Rik 2018-3-24
编辑：Rik 2018-3-24
The code below is the same as the code by KSSV, but without the need for implicit expansion.
c = combnk(1:4,2);
N = c * [10;1];
iwant = [N(1:3) N(length(N):-1:4)];
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Prabha Kumaresan
Prabha Kumaresan 2018-3-26
ok.But i want to group the numbers (3 4,1 2),(2 4,1 3) and (2 3,1 4) in this manner.I dont want to have command line. N = c * [10;1 ] as it does product and sum. I just want to group the numbers.

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