R/examples/ex-ddply.R

dt <- data.table(x = 1:10, y = 1:5)
dt_dlply(dt, .(y), ~.[which.max(x)])
dt_ddply(dt, .(y), ~ top_n(., 1, x))
rpkgs/Ipaper documentation built on March 24, 2024, 3:09 p.m.