summarise: Summarise columns to single values

In tidyft: Fast and Memory Efficient Data Operations in Tidy Syntax

Summarise columns to single values

Description

Create one or more scalar variables summarizing the variables of an existing data.table.

Usage

summarise(.data, ..., by = NULL)

summarise_when(.data, when, ..., by = NULL)

summarise_vars(.data, .cols = NULL, .func, ..., by)

Arguments

.data	A data.table
...	List of variables or name-value pairs of summary/modifications functions for summarise_dt.Additional parameters to be passed to parameter '.func' in summarise_vars.
by	Unquoted name of grouping variable of list of unquoted names of grouping variables. For details see data.table
when	An object which can be coerced to logical mode
.cols	Columns to be summarised.
.func	Function to be run within each column, should return a value or vectors with same length.

Value

A data.table

Examples

a = as.data.table(iris)
a %>% summarise(sum = sum(Sepal.Length),avg = mean(Sepal.Length))


a %>%
  summarise_when(Sepal.Length > 5, avg = mean(Sepal.Length), by = Species)

a %>%
  summarise_vars(is.numeric, min, by = Species)

tidyft documentation built on Jan. 9, 2023, 1:27 a.m.