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index should be removed after unique method #1760

jangorecki opened this Issue Jul 1, 2016 · 0 comments


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jangorecki commented Jul 1, 2016

from SO:

test <- data.table(a = c("1", "1", "2", "2", "3", "4", "4", "4"), 
                   b = letters[1:8], 
                   d = c(TRUE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE))
test[d == TRUE, `:=`(b = "M")] # create index
utest <- unique(test, by = c("a", "b"))
stopifnot(nrow(utest[d == TRUE])==2)
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