[R] delete duplicated from data.frame

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From: Christian Schulz (ozric@web.de)
Date: Wed 19 May 2004 - 00:22:30 EST


Message-id: <200405181622.31221.ozric@web.de>

Hi,

?unique
unique returns a vector, data frame or array like x * but with duplicate
elements removed *

what i'm doing wrong delete duplicated rows with same MEMEBRNO.

februar <- dmsegment[unique(dmsegment$MEMBERNO),]

This reduce from 197.188 rows to 184.199 but duplicated MEMBERNO didn't left
all what a Primary Key setting in mysql me say and with a fix(februar) could
recognize .

Courious why MEMEBRNO 4,5 ,6 and 11 are left !
dmsegment$MEMBERNO[1:10]
[1] 1 4 5 6 7 9 10 11 16 21

februar$MEMBERNO[1:10]
[1] 1 6 7 9 10 16 21 26 53 72

Using unique with a single vector it works like i expect.

P.S.
i try -duplcated but get not better succes?

Many Thanks,
Christian

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