[R-Forge #5205] duplicated.data.table should have a "fromLast" argument similar to base #347
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Description
Submitted by: Arun ; Assigned to: Arun ; R-Forge link
As the title implies...
On data.frames:
set.seed(450)
df <- data.frame(x=sample(2, 10,TRUE), y=sample(3, 10, TRUE))
duplicated(df)
# [1] FALSE FALSE FALSE TRUE FALSE TRUE FALSE TRUE TRUE TRUE
duplicated(df, fromLast=TRUE)
# [1] TRUE TRUE TRUE FALSE FALSE FALSE TRUE TRUE FALSE FALSEOn data.tables:
require(data.table)
dt <- data.table(df)
duplicated(dt)
# [1] FALSE FALSE FALSE TRUE FALSE TRUE FALSE TRUE TRUE TRUEBut, doesn't have a fromLast parameter.