[R] add one variable to a data frame

Sat May 12 01:22:02 CEST 2018

Of course...
Thanks
-Don

--
Don MacQueen
Lawrence Livermore National Laboratory
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On 5/11/18, 3:50 PM, "R-help on behalf of peter dalgaard" <r-help-bounces using r-project.org on behalf of pdalgd using gmail.com> wrote:

    Um, maybe just

    dat1$C <- match(dat1$B, unique(dat1$B))

    Indexing 1:k with numbers between 1 and k is a bit of a no-op...

    AFAICT, this even works without stringsAsFactors=FALSE

    -pd

    > On 11 May 2018, at 21:30 , MacQueen, Don <macqueen1 using llnl.gov> wrote:
    > 
    > dat1$C <- seq(length(unique(dat1$B)))[ match( dat1$B, unique(dat1$B) )]

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