On 13/03/2008, John Kane <[EMAIL PROTECTED]> wrote:
> My thanks to Henrique Dallazuanna and Phil Spector.
> Both solutions worked well.
> Phil suggested that an alterative to my function would
> be
> vect1 = sapply(mylist,'[[',1)
> and I see that Henrique used `[` in his solution.
>
> Can you point me to some documentation that discusses
> these usages. I have seen them before but I have never
> actually figured out how to use them.?
See ?Extract
>
> Thanks.
>
> Problem and solutions
> ========================================================
> mylist <- list(aa=c("cat","peach" ), bb=c("dog",
> "apple", "iron"),
> cc = c("rabbit", "orange", "zinc", "silk"))
> myfun <- function(dff) dff[1]
> vect1 <- unlist(lapply(mylist, myfun))
>
> # Desired output
> t(cbind( c("cat" , "peach" , NA, NA), bbb <- c("dog"
> , "apple" ,"iron", NA),
> ccb <- c("rabbit" ,"orange" ,"zinc" , "silk" )))
>
> # Phil Spector's approach
> mlen = max(sapply(mylist,length))
> eqlens = lapply(mylist,function(x)if(length(x) < mlen)
>
> c(x,rep('',mlen-length(x))) else x)
> do.call(rbind,eqlens)
>
> # "Henrique Dallazuanna" <[EMAIL PROTECTED]>
> # I added the t()
> t(as.data.frame(lapply(mylist, `[`,
> 1:max(unlist(lapply(mylist,
> length))))))
>
>
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>
> http://www.flickr.com/gift/
>
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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