tidyfast (version 0.4.0)

dt_case_when: Case When with data.table

Description

Does what dplyr::case_when() does, with the same syntax, but with data.table::fcase() under the hood.

Usage

dt_case_when(...)

Value

Vector of the same size as the input vector

Arguments

...

statements of the form: condition ~ label, where the label is applied if the condition is met

Examples

x <- rnorm(100)
dt_case_when(
  x < median(x) ~ "low",
  x >= median(x) ~ "high",
  is.na(x) ~ "other"
)

library(data.table)
temp <- data.table(
  pseudo_id = c(1, 2, 3, 4, 5),
  x = sample(1:5, 5, replace = TRUE)
)
temp[, y := dt_case_when(
  pseudo_id == 1 ~ x * 1,
  pseudo_id == 2 ~ x * 2,
  pseudo_id == 3 ~ x * 3,
  pseudo_id == 4 ~ x * 4,
  pseudo_id == 5 ~ x * 5
)]