Discrete position.

Usage

scale_x_discrete(..., expand = waiver())

scale_y_discrete(..., expand = waiver())

Arguments

...

common discrete scale parameters: name, breaks, labels, na.value, limits and guide. See discrete_scale for more details

expand

a numeric vector of length two giving multiplicative and additive expansion constants. These constants ensure that the data is placed some distance away from the axes.

Examples

qplot(cut, data=diamonds, stat="bin")


qplot(cut, data=diamonds, geom="bar")



# The discrete position scale is added automatically whenever you
# have a discrete position.

(d <- qplot(cut, clarity, data=subset(diamonds, carat > 1), geom="jitter"))



d + scale_x_discrete("Cut")


d + scale_x_discrete("Cut", labels = c("Fair" = "F","Good" = "G",
  "Very Good" = "VG","Perfect" = "P","Ideal" = "I"))



d + scale_y_discrete("Clarity")


d + scale_x_discrete("Cut") + scale_y_discrete("Clarity")



# Use limits to adjust the which levels (and in what order)
# are displayed
d + scale_x_discrete(limits=c("Fair","Ideal"))

Warning message:
Removed 11189 rows containing missing values (geom_point).


# you can also use the short hand functions xlim and ylim
d + xlim("Fair","Ideal", "Good")

Warning message:
Removed 9610 rows containing missing values (geom_point).

d + ylim("I1", "IF")

Warning message:
Removed 16770 rows containing missing values (geom_point).


# See ?reorder to reorder based on the values of another variable
qplot(manufacturer, cty, data=mpg)


qplot(reorder(manufacturer, cty), cty, data=mpg)


qplot(reorder(manufacturer, displ), cty, data=mpg)



# Use abbreviate as a formatter to reduce long names
qplot(reorder(manufacturer, cty), cty, data=mpg) +
  scale_x_discrete(labels = abbreviate)

See also