[R] simple question on picking out some rows of a matrix/data frame

Douglas Bates bates at stat.wisc.edu
Mon Feb 9 22:05:05 CET 2004

"subset" will do the selection.  If you really want a matrix for the
result you will need to coerce it using "as.matrix".

Roger Levy <rog at stanford.edu> writes:

> I have a simple question about matrix/data frame manipulation.  I have
> a data frame that looks a something like this
>   X    Y    Z
>   1    0    "apples"
>   -1   -1   "oranges"
>   ...
>   0    -1   "bananas"
> and I'd like to pull out all the rows for which X and Y are (un)equal
> into a submatrix.
> How can I do that?
> Many thanks,
> Roger Levy

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