Hi
r-help-boun...@r-project.org napsal dne 24.02.2009 06:23:23:
> Hi R users,
>
> I have a question. How can I use for loop to do pair comparisons. For
> example,
>
> > x<-c(1,2,3)
>
> > result<-matrix(data=NA, nrow=choose(3,2), ncol=1)
>
> > for(i in 1: length(x))
>
> + { result[i,]<-ifelse(x[i] > x[i+1], yes="Big", no="Small")
>
> + result}
>
> > result
>
> [,1]
>
> [1,] "Small"
>
> [2,] "Small"
>
> [3,] NA
Well. It is a little cryptic what you want.
Suppose you have 100 x values. What is x value number 101?
If you want to check if subsequent value is bigger or smaller then
previous one use
diff(x) and test diff(x)>0.
Regards
Petr
>
>
>
> I want to compare (1 vs. 2), (1 vs. 3), (2 vs.3)
>
> I know I miss something but I just can not get it work. Could anyone
give me
> a hint?
>
>
>
> Appreciate,
>
> Chunhao
>
>
> [[alternative HTML version deleted]]
>
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