head.dtplyr_step: Subset first or last rows

In hadley/dtplyr: Data Table Back-End for 'dplyr'

Subset first or last rows

Description

These are methods for the base generics head() and tail(). They are not translated.

Usage

## S3 method for class 'dtplyr_step'
head(x, n = 6L, ...)

## S3 method for class 'dtplyr_step'
tail(x, n = 6L, ...)

Arguments

x	A lazy_dt()
n	Number of rows to select. Can use a negative number to instead drop rows from the other end.
...	Passed on to head()/tail().

Examples

library(dplyr, warn.conflicts = FALSE)
dt <- lazy_dt(data.frame(x = 1:10))

# first three rows
head(dt, 3)
# last three rows
tail(dt, 3)

# drop first three rows
tail(dt, -3)

hadley/dtplyr documentation built on Feb. 22, 2024, 4:40 a.m.