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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