[datatable-help] data.table: partition like aggregate (FUN = list)
Dan Muresan
danmbox at gmail.com
Mon Apr 28 05:56:52 CEST 2014
Hi,
> dt[, list(x=list(I(x)), y=list(I(y))), by=list(grp = x %% 3)]
this seems to work and is pretty natural. I guess the idea was to wrap
the result twice in list(). Thanks.
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