[R] grouping elements of a data frame
David Winsemius
dwinsemius at comcast.net
Tue Jan 15 23:10:53 CET 2013
On Jan 15, 2013, at 9:10 AM, Nuri Alpay Temiz wrote:
> Hi everyone,
>
> I have a question on selecting and grouping elements of a data frame. For example:
>
> A.df<- [ a c 0.9
> b x 0.8
> b z 0.5
> c y 0.9
> c x 0.7
> c z 0.6]
That is not R code. Matlab?, Python?
>
>
> I want to create a list of a data frame that gives me the unique values of column 1 of A.df so that i can create intersects. That is:
>
> B[a]<- [ c 0.9]
>
> B[b]<- [ x 0.8
> z 0.5]
>
> B[c]<- [ y 0.9
> x 0.7
> z 0.6]
>
>
> B[c] n B[b] <- c(x,z)
>
That's some sort of coded message? We are supposed to know what the "n" operation will do when assigned a vector?
Assuming your really do have a dataframe named B:
intersect(B$c, B$b)
Please code up examples in R in the future.
--
David Winsemius
Alameda, CA, USA
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