refactor: Fast removing unessacery levels from factor columns

In DavidArenburg/dt.nuggets: Some convinience functions using the data.table package

Description

Fast removing unessacery levels from factor columns

Usage

refactor(DT, cols)

Arguments

DT	The data.table to operate on
cols	(optional) Quoted column names

Value

The modified data.table with the refactored columns

Examples

set.seed(123)
DT <- data.table(x = sample(10),
                 y = sample(1:2, 10, replace = TRUE),
                 z = factor(sample(letters, 10)),
                 l = factor(sample(LETTERS, 10)))

SDT <- DT[sample(5)]
str(SDT)
refactor(SDT)
str(SDT)
SDT <- DT[sample(5)]
str(SDT)
refactor(SDT, "z")
str(SDT)

DavidArenburg/dt.nuggets documentation built on May 6, 2019, 1:54 p.m.