[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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