[R] for-loop with multiple variables changing

[Sean Davis]

On 2/6/06 5:53 AM, "Piet van Remortel" <piet.vanremortel at gmail.com> wrote:

> Hi all,
> 
> Never really managed to build a for-loop with multiple running
> variables in an elegant way.
> 
> Can anybody hint ?
> 
> See below for an example of what I would like.
> 
> EXAMPLE
> a<-c(1,2,3)
> b<-c("name1","name2","name3")
> 
> for( number in a, name in b ) {
> print( number ) ##take a value
> print( name ) ##and have its name available from a second list
> }
> 
> Does R support this natively ?

I'm not sure what language does support this construct natively?  In any
case, what about:

 for (j in a) {
    print(a[j])
    print(b[j])
 }

You may be thinking of a "hash" structure.  If you are, you could look at
using lists.  See the R-intro on using list data structures.

Sean