[18704] in s-news-athena
[S] RE: Removing identical obervations
daemon@ATHENA.MIT.EDU (Gunter, Bert)
Thu Jul 22 08:53:29 1999
Message-Id: <199907221249.HAA29740@wubios.wustl.edu>
Date: Thu, 22 Jul 1999 08:47:50 -0400
From: "Gunter, Bert" <bert_gunter@merck.com>
To: s-news@wubios.wustl.edu,
"'Venables, Bill (CMIS, Cleveland)'" <Bill.Venables@cmis.CSIRO.AU>
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> This is sometimes a useful idiom, but it's rather lazy. Suppose your data
> frame is "dat"
>
> newdat <- dat[!duplicated(do.call("paste", c(as.list(dat), list(sep =
> "\t")))), ]
>
> should remove all exactly repeated rows. In your case it will probably be
> OK,
>
*****
> but if you had really large numbers of variables you might like to think
> again.
******
> Bill Venables.
>
Bill:
I would appreciate amplification on your last remark between the ****. Why
would you like to think again in this case and how how else would you do it?
Bert Gunter
Biometrics Research RY 32-305
Merck & Company
P.O. Box 2000
Rahway, NJ 07065-0900
Phone: (732) 594-7765 Fax: (732) 594-1565
"The business of the statistician is to catalyze the scientific learning
process." -- George E.P. Box
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