R help - May 2000 - Partitioning matrices and drop

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.

I am using version 0.90.1

Can someone tell me how I''m wrong?

Thanks
Ross Darnell
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