dt_group_by {dataMojo} | R Documentation |
group by columns and return a summarized table
dt_group_by(dt, group_by_cols, summarize_at, operation)
dt |
input data.table |
group_by_cols |
group by columns |
summarize_at |
column summarize at |
operation |
calculation operation, value should be one of following: sum, mean, median, max, min |
a summarized table
data("dt_groups")
dataMojo::dt_group_by(dt_groups,
group_by_cols = c("group1", "group2"),
summarize_at = "A1",
operation = "mean")