[R] Removing rows in dataframe w'o duplicated values

[B77S]

This is ugly, but it gets what you want. 

dat[which(dat[,1] %in% unique((dat[duplicated(dat[,1], fromLast = T),
1]))),]






AC Del Re wrote
> 
> Hi,
> 
> Is there an easy way to remove dataframe rows without duplicated values of
> a specified column ('id')?  e.g.,
> 
> dat <- data.frame(id = c(1,1,1,2,3,3), value = c(5,6,7,4,5,4), value2 =
> c(1,4,3,3,4,3))
> dat
> 
>   id value value2
> 1  1     5      1
> 2  1     6      4
> 3  1     7      3
> 4  2     4      3
> 5  3     5      4
> 6  3     4      3
> 
> 
> This is sample data and the real data has hundreds of rows. In this
> case, only row 4 does not have a duplicated id and I would like to
> remove it without using:
> 
> 
> dat$id[4] <- NULL
> 
> 
> Any help is appreciated!
> 
> 
> AC
> 
> 	[[alternative HTML version deleted]]
> 
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> and provide commented, minimal, self-contained, reproducible code.
> 


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