aggregate_where: Conditional aggregation

In radbrt/rowpatternmatcher: Select rows based on pattern

Description

Aggregate a column where some condition is true - meant to be used inside tidy functions. This is not even a convenience function as it can be done simpler in native tidyverse (se examples). The function exists in order to highlight a programming pattern.

Usage

aggregate_where(fun, var, cond)

Arguments

fun	The aggregation function to run
var	The variable to run the function on
cond	The condition to filter on

Examples

## Not run: 
mutate(msft, fincol = aggregate_where(mean, adj_close, change=="UP") )

# Equivalent to
mutate(msft, fincol = mean(adj_close[change=="UP"] ))

## End(Not run)

radbrt/rowpatternmatcher documentation built on Nov. 5, 2019, 2:07 a.m.