statar (version 0.4.0)

keep_if: Create new data.table by keeping only certain rows(equivalent to dplyr::filter)

Description

Create new data.table by keeping only certain rows(equivalent to dplyr::filter)

Usage

keep_if(x, ..., by = NULL)
keep_if_(x, .dots, by = NULL)

Arguments

x

a data.table

...

Conditions

by

groups in which the condition should be evaluated

.dots

Used to work around non-standard evaluation.

Examples

library(data.table)
DT <- data.table(
  id = c(1,2,1),
  v1 = c(1,NA,2)
)
keep_if(DT, v1 == 1)
keep_if(DT, v1 == min(v1), by = id)