[R] simple question on picking out some rows of a matrix/data frame
John Fox
jfox at mcmaster.ca
Mon Feb 9 22:28:02 CET 2004
Dear Roger,
Something like mat[mat[,1] == mat[,2],] or mat[mat[,1] != mat[,2],]
should give you what you want.
I hope that this helps,
John
On 09 Feb 2004 12:22:48 -0800
Roger Levy <rog at stanford.edu> wrote:
> Hi,
>
> 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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