There's an optional "drop" argument to the indexing operations, which is by
default TRUE. You just want
> x[4:6,,drop=FALSE]
[,1]
[1,] 4
[2,] 5
[3,] 6
Reid Huntsinger
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Crispin Miller
Sent: Thursday, September 01, 2005 10:54 AM
To: [email protected]
Subject: [R] Matrices with a single column
Hi,
I've got a quick question about what happens when indexing into matrices
with a single column. I was wondering if anyone can help ...
For example:
> x <- matrix(1:10)
> y <- cbind(x,x)
> x[4:6,]
[1] 4 5 6
> y[4:6,]
[,1] [,2]
[1,] 4 4
[2,] 5 5
[3,] 6 6
> class(x[4:6,])
[1] "integer"
> class(y[4:6,])
[1] "matrix"
It seems that R is returning the results of indexing into a matrix with
one column as a vector rather than a matrix?
Does anyone have a good way of preventing this from happening?
cheers,
crispin
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