Hello -
cruz wrote:
Hi,
I am writing this in a wrong way, can someone please correct me?
A <- matrix()
length(A) <- 6
dim(A) <- c(3,2)
colnames(A) <- c("X","Y")
A
X Y
[1,] NA NA
[2,] NA NA
[3,] NA NA
A$X
Error in A$X : $ operator is invalid for atomic vectors
A[, "X"] may be what you want?
See the details of ?Extract about how '$' only works on recursive
(list-like) objects, of which your matrix A is not one of.
Thanks,
cruz
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