How to make combinations of given condition?

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C Zeng
C Zeng 2012-12-28
Hi, all,
For example, if I want to make all combination of 5-dim vectors have only 2 two's, other entries are all 0. Is there a command in Matlab can do it? That is 22000 20200 20020 20002 02200 02020 02002 00220 00202 00022
Thanks.

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Andrei Bobrov
Andrei Bobrov 2012-12-28
编辑：Andrei Bobrov 2012-12-28
k = dec2bin(0:sum(pow2(0:4)))-'0';
out = 2*k(sum(k,2) == 2,:);
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C Zeng
C Zeng 2012-12-28
Andrei, thanks, can you explain?
Actually I want all other entries to be 1. Is there a way to do it easily?
I tried your code, it works here though not understood here. :-(

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更多回答（1 个）

Roger Stafford
Roger Stafford 2012-12-28
This is a problem for matlab's 'nchoosek' function.

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