On Apr 17, 2010, at 2:25 PM, <mau...@alice.it> wrote:
After some headache with debugging my script, I finally isolated the
problem taht I am going to illustrate in the following example.
I expected matrix nrow to decrease consistently till 1. Instead,
when the matrix is left with one row only, its nrow jumps to 2
because the matrix
gets transposed. How come ?
Because you did not use drop=FALSE? (And I think it's a FAQ.)
> #REMOVE ROW-1 OUT OF 3
> B <- as.matrix(B[-1,,drop=FALSE])
> B
[,1] [,2]
3 4
5 6
> #REMOVE ROW-2 OUT OF 3
> B <- as.matrix(B[-1, ,drop=FALSE])
> B
[,1] [,2]
5 6
> nrow(B)
[1] 1
Thank you,
Maura
B <- c(1,2)
B <- rbind(B,c(3,4))
B <- rbind(B,c(5,6))
B
[,1] [,2]
B 1 2
3 4
5 6
dim(B)
[1] 3 2
nrow(B)
[1] 3
#REMOVE ROW-1 OUT OF 3
B <- as.matrix(B[-1,])
B
[,1] [,2]
3 4
5 6
dim(B)
[1] 2 2
nrow(B)
[1] 2
#REMOVE ROW-2 OUT OF 3
B <- as.matrix(B[-1,])
B
[,1]
[1,] 5
[2,] 6
dim(B)
[1] 2 1
nrow(B)
[1] 2
tutti i telefonini TIM!
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and provide commented, minimal, self-contained, reproducible code.
