On Dec 11, 2009, at 5:33 PM, Jennifer Young wrote:
Good evening
I often have as output from simulations a list of various values,
vectors
and matrices.
Supposing that I then run said simulation several times, I often
want to
extract a particular result from each simulation for plotting and,
ideally, put it in a matrix.
A simple example
v1 <- 1:5
v2 <- 6:10
other1 <- "stuff"
other2 <- "stuff"
set1 <- list(v1,other1)
names(set1) <- c("vec","other")
set2 <- list(v2,other2)
names(set2) <- c("vec","other")
output <- list(set1, set2)
Is there some form of lapply() that will allow me to extract v1 and v2
(ie, the $vec elements) from both sets?
Bonus if I can then put it into a matrix tidily.
> matrix(unlist(lapply(output, "[", "vec")), ncol=2)
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
Or maybe even more directly:
> sapply(output, "[[", "vec")
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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