say I have a matrix and lists like
x <- matrix(c(12.1, 3.44, 0.1, 3, 12, 33.1, 1.1, 23), nrow=2)
x.list <- lapply(seq_len(nrow(x)), function(i) x[i,])
if I want a column of the matrix x, I write
x[, 2]
for example.
But how can I do something similar for a set of lists, x.list, above?
> x.list
[[1]]
[1] 12.1 0.1 12.0 1.1
[[2]]
[1] 3.44 3.00 33.10 23.00
unlist(x.list)[,2] does not work.
Anyone?
ishida
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