[R] Index of a Loop Variable?
jjava at priscian.com
Wed Apr 7 15:30:49 CEST 2004
Thanks to everyone who's responded to my request for info -- the replies
have been helpful and interesting. They'll certainly help me towards
thinking more cleverly in R....
Barry: I'd like to see your looping class, but only if you haven't anything
better to do over your break than trying to put it together again. :)
-- Jim J.
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-
> bounces at stat.math.ethz.ch] On Behalf Of Gabor Grothendieck
> Sent: Wednesday, April 07, 2004 12:30 AM
> To: r-help at stat.math.ethz.ch
> Subject: Re: [R] Index of a Loop Variable?
> You could define the utility function iter:
> iter <- function(x) mapply( x, seq(along=x),
> FUN=function(x,i)list(x=x,i=i), SIMPLIFY=F )
> and use it like this to loop over seq(5,50,5) and 1:10 simultaneously:
> > for(idx in iter(seq(5,50,5))) with(idx, cat(x,i,"\n"))
> 5 1
> 10 2
> 15 3
> 20 4
> 25 5
> 30 6
> 35 7
> 40 8
> 45 9
> 50 10
> Jim Java writes--
> Hi Everyone:--
> Is it possible, within a for loop not explicitly using whole-number
> indexing, to find out the index value of the loop variable within the
> vector or list that's being looped through?
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