[datatable-help] Create matrix of columns from grouped rows

nachti kpm.nachtmann at gmail.com
Wed Nov 23 20:11:30 CET 2016


Try this:

t1 <- dt[, unlist(.SD), by = id]
t(unstack(t1, form = V1 ~ id))

(I think you get done with the colnames yourself ...)

Cheers,
~g



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