[R] uniq -c

[Sam Steingold]

> * Duncan Murdoch <zheqbpu.qhapna at tznvy.pbz> [2012-10-16 12:47:36 -0400]:
> sparseby(data=x, INDICES=x, FUN=nrow)

Error in `[<-.data.frame`(`*tmp*`, index, , value = list(user = c(2L,  : 
  missing values are not allowed in subscripted assignments of data frames



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