[R] one question about the loop

[jim holtman]

Is this what you want?

> t(combn(5,2))
      [,1] [,2]
 [1,]    1    2
 [2,]    1    3
 [3,]    1    4
 [4,]    1    5
 [5,]    2    3
 [6,]    2    4
 [7,]    2    5
 [8,]    3    4
 [9,]    3    5
[10,]    4    5
>


On 7/7/07, Zhang Jian <jzhang1982 at gmail.com> wrote:
> Hi.
> I want to get a series data just like this:
> sp1 sp2
> 1   2
> 1   3
> 1   4
> 1   5
> 2   3
> 2   4
> 2   5
> 3   4
> 3   5
> 4   5
>
> I can get one part of the data every time, but I can get the data directly.
> I try to use the loop, but it can not work. How to get it ? Thanks.
>
> pair.fn=function(i,sp=5){res=data.frame(sp1=rep(i,(sp-i)),sp2=(i+1):sp)
> return(res)}
> pair.fn(1)
> pair.fn(2)
> .....
>
>        [[alternative HTML version deleted]]
>
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>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?