Geom.bar

Draw bar plots. This geometry works on pre-summarized data such as counts. To draw histograms from a series of observations, add Stat.histogram to the plot, or use the convenient geometry Geom.histogram.

Aesthetics

• y: Height of each bar.

• color (optional): Group categorically by color.

Either

• x: Position of each bar.

Or

• xmin: Starting x positions for each bar.

• xmax: End x positions for each bar.

If x is given, a bar will be drawn at each x value, specifying both xmin and xmax allows bars of variable width to be drawn.

Arguments

• position: Either :stack or :dodge. If the color aesthetic is bound this determines how bars of different colors should be arranged: stacked on top of each other, or placed side by side.

• orientation: Either :vertical (default) or :horizontal. If :horizontal, then the required aesthetics are y or ymin/ymax.

Examples

plot(dataset("HistData", "ChestSizes"), x="Chest", y="Count", Geom.bar)

plot(by(dataset("datasets","HairEyeColor"),[:Eye,:Sex], d->sum(d[:Freq])),
    color="Eye", y="x1", x="Sex",
    Geom.bar(position=:dodge), Guide.ylabel("Freq"))

D = by(dataset("datasets","HairEyeColor"), [:Eye,:Sex], d->sum(d[:Freq]))
 rename!(D, :x1, :Frequency)
# Is there a hazel color?
palette=["brown","blue","tan","green"]

pa= plot(D, x=:Sex, y=:Frequency, color=:Eye, Geom.bar(position=:stack),
    Scale.color_discrete_manual(palette...)
)
pb= plot(D, x=:Sex, y=:Frequency, color=:Eye, Geom.bar(position=:stack),
    Scale.color_discrete_manual(palette[4:-1:1]..., order=[4,3,2,1])
)
hstack(pa, pb)

See Scale.color_discrete_manual for more information.