Math Question_ Combination

2 次查看（过去 30 天）

Kyle 2011-6-28

Hi,

Let say i have 10 location. I wana test 3 location at a time.

i think there are 10C3=120 combination.(assuming order of the location is not important).

My question is how do i list all the combination in an array?

For example [1 2 3,1 2 4, 1 2 5 ,. . . . . till the 120th]

Oleg Komarov 2011-6-28

nchoosek(1:10,3)

Kyle 2011-6-28

:X i dint even know there is such a command.

Oleg Komarov 2011-6-28

There are many valuable contributions on the FEX which cover combinatorics. I personally use combinator.

Sean de Wolski 2011-6-28

That's a fun little challenge before lunch break:

[xx yy zz] = ndgrid(1:10);
vals = unique(sort([xx(:),yy(:),zz(:)],2),'rows');
vals(any(~diff(vals,1,2),2),:) = [];

Kyle 2011-6-28

Thanks

XD tat was too less of a challenge for u.

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