[R] Counting occurrences of a set of values

[Frank Schwidom]

df <- data.frame( V1= 1, V2= c( 2, 3, 2, 1), V3= c( 1, 2, 1, 1))
dfO <- df[ do.call( order, df), ]
dfOD <- duplicated( dfO)
dfODTrigger <- ! c( dfOD[-1], FALSE)
dfOCounts <- diff( c( 0, which( dfODTrigger)))
cbind( dfO[ dfODTrigger, ], dfOCounts)

  V1 V2 V3 dfOCounts
4  1  1  1         1
3  1  2  1         2
2  1  3  2         1

Regards


On Thu, Sep 10, 2015 at 01:11:24PM +0000, Thomas Chesney wrote:
> Can anyone suggest a way of counting how frequently sets of values occurs in a data frame? Like table() only with sets.
> 
> So for a dataset:
> 
> V1, V2, V3
> 1, 2, 1
> 1, 3, 2
> 1, 2, 1
> 1, 1, 1
> 
> The output would be something like:
> 
> 1,2,1: 2
> 1,3,2: 1
> 1,1,1: 1
> 
> Thank you,
> 
> Thomas Chesney
> 
> 
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