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Initialize

library(dplyr)
library(tidy)

Syntax with piping

Using the %>% symbol, output from one command can be sent to another.

For example if salesdata is a data.frame, the head command selects the first 5 rows. Thus the command

salesdata <- data.frame(xxx)
head(salesdata)

prints the first five lines on the screen. The same command can be written as

salesdata <- data.frame(xxx)
salesdata %>% head()

This different way of writing, piping the results to the head command is useful when many processing steps are to be taken.

Piping with dplyr

The following code creates the salesdata data.frame. The date and product columns are then selected. The data is then sorted by date and the resultant new dataset is stored in proddata.

salesdata <- data.frame(xxx)
salesdata %>% 
select(date, product) %>% 
arrange(date) ->
proddata

bjornerstedt/assist documentation built on May 12, 2019, 9:26 p.m.