Hi Nan,

See ?ifelse

edu[,2] <- ifelse(edu[,1] < 0.5, 1, 2)
edu

HTH,
Jorge


On Mon, Aug 2, 2010 at 9:16 PM, Hey Sky <> wrote:

> Hey, Rers
>
> I am new to R and this question may has been asked many times or a very old
> one. I have checked
>
> the archive but found nothing (maybe I used the wrong key words). any
> advise is
> appreciated
>
> the question is:
>
> I try to replace a col vector with some other values, see
>
> edu<-matrix(0,1000,2)
>
> edu1<-runif(1000,0,1)
> edu[,1]<-edu1
>
> the colum  vector edu[,1]  would have value between 0 and 1. if I want to
> replace the value of edu[,2]
>
> to 1 if edu[,1] less than 0.5, how to do it in the form of matrix but
> not under
> a loop structure?
>
> I have tried:
>
> if (edu[,1]>=0.5) edu[,2]=1
>
> there is only the first 0.5 have been done but not all the others. thanks
> for
> any kind answer.
>
> Nan
> from Montreal
>
>
>
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>

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