order_by

0th

Percentile

A helper function for ordering window function output

This function makes it possible to control the ordering of window functions in R that don't have a specific ordering parameter. When translated to SQL it will modify the order clause of the OVER function.

Usage
order_by(order_by, call)
Arguments
order_by

a vector to order_by

call

a function call to a window function, where the first argument is the vector being operated on

Details

This function works by changing the call to instead call with_order() with the appropriate arguments.

Aliases
  • order_by
Examples
# NOT RUN {
order_by(10:1, cumsum(1:10))
x <- 10:1
y <- 1:10
order_by(x, cumsum(y))

df <- data.frame(year = 2000:2005, value = (0:5) ^ 2)
scrambled <- df[sample(nrow(df)), ]

wrong <- mutate(scrambled, running = cumsum(value))
arrange(wrong, year)

right <- mutate(scrambled, running = order_by(year, cumsum(value)))
arrange(right, year)
# }
Documentation reproduced from package dplyr, version 0.7.8, License: MIT + file LICENSE

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