On Fri, Aug 17, 2007 at 05:32:54PM -0400, Dale Steele wrote:
> I'm trying to create two variables (dka and newsonset) from the
> following composite character variable diagnosis:
>
> diagnosis <- c("hypoglycemia","diabetes" ,"newonset&dka", "newonset",
> "diabetes", "dka&GI", "diabetes&GI", "newonset", "dka")
>
> I can extract the indices for dka and newonset using the following....
>
> > grep("dka", diagnosis)
> [1] 3 6 9
> > grep("newonset", diagnosis)
> [1] 3 4 8
>
> How do I create
>
> dka = c(0,0,1,0,0,1,0,0,1)
> newonset = c(0,0,1,1,0,0,0,1,0)
dka <- sequence(0,0,length.out=NROW(diagnosis))
dka[grep("dka",diagnosis)] <- 1
similar for newonset
--
Daniel Lakeland
[EMAIL PROTECTED]
http://www.street-artists.org/~dlakelan
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