[R] Find "undirected" duplicates in a tibble

Eric Berger er|cjberger @end|ng |rom gm@||@com
Fri Aug 20 15:38:19 CEST 2021


x %>% transmute( a=pmin(Source,Target), b=pmax(Source,Target)) %>%
  unique() %>% rename(Source=a, Target=b)



On Fri, Aug 20, 2021 at 2:12 PM Greg Minshall <minshall using umich.edu> wrote:

> Kimmo,
>
> i'll be curious to see other, maybe more elegant, answers.  in the
> meantime, this seems to work.
>
> ----
>   x = data.frame(Source=rep(1:3,4),
> Target=c(rep(1,3),rep(2,3),rep(3,3),rep(4,3)))
>   y <- apply(x, 1, function(y) return (c(n=min(y), x=max(y))))
>   res <- data.frame()
>   for (n in unique(y["n",])) {
>     unique(y["x",y["n",]==n])
>     res <- rbind(res, data.frame(A=c(n), B=unique(y["x",y["n",]==n])))
>   }
>   res
> ----
>
> thanks for the question!
>
> cheers, Greg
>
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