reframe.dtplyr_step: Summarise each group to one row

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

Summarise each group to one row

Description

This is a method for the dplyr reframe() generic. It is translated to the j argument of ⁠[.data.table⁠.

Usage

## S3 method for class 'dtplyr_step'
reframe(.data, ..., .by = NULL)

Arguments

.data	A lazy_dt().
...	<data-masking> Name-value pairs of functions. The name will be the name of the variable in the result. The value can be a vector of any length. Unnamed data frame values add multiple columns from a single expression.
.by	<tidy-select> Optionally, a selection of columns to group by for just this operation, functioning as an alternative to group_by(). For details and examples, see ?dplyr_by.

Examples

library(dplyr, warn.conflicts = FALSE)

dt <- lazy_dt(mtcars)

dt %>%
  reframe(qs = quantile(disp, c(0.25, 0.75)),
          prob = c(0.25, 0.75),
          .by = cyl)

dt %>%
  group_by(cyl) %>%
  reframe(qs = quantile(disp, c(0.25, 0.75)),
          prob = c(0.25, 0.75))

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