I want to fill up vector a with vector b. The condition is: b<200,
otherwise don't fill it up.
Mike
On Thu, Nov 29, 2012 at 6:11 PM, David Winsemius <dwinsem...@comcast.net>wrote:
>
> On Nov 29, 2012, at 1:55 PM, C W wrote:
>
> > Hi list,
> > I am writing a for loop that looks like this:
> > samples<-rep(NA,10)
> > x <- rep(c(111, 225), 5)
> > for(i in 1:10){
> > If(x[i]<200){
> > samples[i] <- x[i]
> > }else{
> > i=i-1
>
> If you expected the else clause to assign something to the samples vector,
> you are mistaken.
>
> > }
> > }
> >
> > The problem is that the returning vector still contains NA, I think the
> i
> > in "else" is not getting subtracted. How should I get it to work?
>
> You could start by telling us what you wanted to happen. You can change
> the index of a for loop inside the body, but it will not "back up the
> process" since at the end of the loop the next "i" will not depend on what
> you changed it to inside the loop.
>
> --
>
> David Winsemius, MD
> Alameda, CA, USA
>
>
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