train_discrete: Train (update) a discrete scale
In hadley/scales: Scale Functions for Visualization

train_discrete

R Documentation

Train (update) a discrete scale

Train (update) a discrete scale

train_discrete(new, existing = NULL, drop = FALSE, na.rm = FALSE, fct = NA)

`new`	New data to add to scale
`existing`	Optional existing scale to update
`drop`	`TRUE`, will drop factor levels not associated with data
`na.rm`	If `TRUE`, will remove missing values
`fct`	Treat `existing` as if it came from a factor (ie. don't sort the range)