Data Transformation with data.table :: CHEAT SHEET
functionality. The basics of working with data.tables are: dt[i, j, by] Take data.table dt, subset rows using i and manipulate columns with j, grouped according to by. data.tables are also data frames –functions that work with data frames therefore also work with data.tables. data.table(a = c(1, 2), b = c("a", "b"))–create a data.table from ...
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