Marianne -
The function you're looking for is mapply:
mapply(function(one,two)one[two],x,y)
[[1]]
[1] "one"
[[2]]
[1] "four" "five"
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Tue, 24 Aug 2010, Marianne Promberger wrote:
I have two lists of the same shape, like this:
x <- list()
x[[1]] <- c("one","two")
x[[2]] <- c("three","four","five")
y <- list()
y[[1]] <- c(TRUE,FALSE)
y[[2]] <- c(FALSE,TRUE,TRUE)
I would like to index x "by" y, that is, the result in this case
should be:
z
[[1]]
[1] "one"
[[2]]
[1] "four" "five"
I was hoping
sapply(x,"[",y)
would work, but it doesn't.
I guess I need to sapply twice, like
sapply(x, function() { sapply(y ...
but I can't figure it out.
Many thanks for any pointers
Marianne
--
Marianne Promberger PhD, King's College London
http://promberger.info
R version 2.11.1 (2010-05-31)
Ubuntu 9.04
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