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[Collins, Gary]

>I have some code 
>
>
>         Xj<-X[Jlist[[M]],Xjlist[[M]],drop=F] 
>
>
>which I use to partition the matrix X. However 
>when the second argument is a single number, Xj is not a
matrix but a 
>vector. I thought the drop=F argument should have kept Xj a
matrix. 

It does work, look at the following example

> X
     [,1] [,2] [,3]
[1,]    1    5    6
[2,]    2    6    6
[3,]    3    7    8
[4,]    4    8    8

> Xj<-X[c(2,3),c(1,2),drop=F] 
> Xj
     [,1] [,2]
[1,]    2    6
[2,]    3    7

> Xj<-X[c(2,3),2, drop=F) 
> Xj
     [,1]
[1,]    6
[2,]    7

> is.matrix(Xj)
[1] TRUE

>
>
>I am using version 0.90.1 

This is probably your problem, you a bit out of date now, R
1.0.1 has been available since
14/04/2000!! Get the latest version, I gather many things
have changed from pre 1.0.0.

>
>
>Can someone tell me how I'm wrong? 
>
>
>Thanks 
>Ross Darnell 

Hope this helps.

Gary.

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