On 10/25/2010 8:56 PM, Daisy Englert Duursma wrote:
Hello,
If I have a dataframe:
example(data.frame)
zz<-c("aa_bb","bb_cc","cc_dd","dd_ee","ee_ff","ff_gg","gg_hh","ii_jj","jj_kk","kk_ll")
ddd<- cbind(dd, group = zz)
and I want to divide the column named group by the "_", how would I do this?
so instead of the first row being
x y fac char group
1 1 C a aa_bb
it should be:
x y fac char group_a group_b
1 1 C a aa bb
I know for a vector I can:
x1<- c("a_b","b_c","c_d")
do.call("rbind",strsplit(x1, "_"))
but I am not sure how this relates to my data.frame
Thanks,
Daisy
Daisy,
You've already gotten a couple of responses, but I thought I'd point out
an different approach (the let-someone-else-deal-with-the-details
approach). The reshape package has a colsplit function which is
designed just for this sort of thing.
library("reshape")
ddd <- cbind(ddd, colsplit(ddd$group, split="_", names=c("group_a",
"group_b")))
--
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University
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