[R] delete duplicated from data.frame

[Christian Schulz]

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