| To: | "Leeds, Mark" <mleeds@mlp.com>, s-news@lists.biostat.wustl.edu |
|---|---|
| Subject: | Re: a vector question |
| From: | "Richard M. Heiberger" <rmh@temple.edu> |
| Date: | Mon, 18 Apr 2005 23:00:18 -0400 |
> x <- c(T,F,T,T,F)
> names(x) <- c(1806,1806,1923,1806,6429)
> x
1806 1806 1923 1806 6429
T F T T F
> tapply(x, names(x), sum)[names(x)]
1806 1806 1923 1806 6429
2 2 1 2 0
>
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