R help - Dec 2009 - apply on two lists?

x=list(a=c(1,2),b=c(3,4,5))
y=list(a=c(1,2),b=c(3,4,5))
lapply(seq(along=x),function(i){cbind(x[[i]],y[[i]])})


I need to apply some function on two lists. I have to use the index to
do as shown above. But I feel more natural to refer to the lists
without using the index (using the syntax of something like,
lapply(x,y, function(i,j){....})). I'm wondering if there is such a
thing in R? Or there are some other ways better than the example at
the very beginning?

On Nov 30, 2009, at 11:07 PM, Peng Yu wrote:
> x=list(a=c(1,2),b=c(3,4,5))
> y=list(a=c(1,2),b=c(3,4,5))
> lapply(seq(along=x),function(i){cbind(x[[i]],y[[i]])})
mapply("cbind", x, y)
>
>
> I need to apply some function on two lists. I have to use the index to
> do as shown above. But I feel more natural to refer to the lists
> without using the index (using the syntax of something like,
> lapply(x,y, function(i,j){....})). I'm wondering if there is such a
> thing in R? Or there are some other ways better than the example at
> the very beginning?
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

why don't you try this tmp=list(X=x,Y=y) and then lapply(tmp,fun(..))

Peng Yu wrote:
> 
> x=list(a=c(1,2),b=c(3,4,5))
> y=list(a=c(1,2),b=c(3,4,5))
> lapply(seq(along=x),function(i){cbind(x[[i]],y[[i]])})
> 
> 
> I need to apply some function on two lists. I have to use the index to
> do as shown above. But I feel more natural to refer to the lists
> without using the index (using the syntax of something like,
> lapply(x,y, function(i,j){....})). I'm wondering if there is such a
> thing in R? Or there are some other ways better than the example at
> the very beginning?
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 
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