Polar coordinates
The polar coordinate system is most commonly used for pie charts, which are a stacked bar chart in polar coordinates.
This coordinate system has one argument, theta
, which determines which variable is mapped to angle and which to radius. Valid values are "x" and "y".
See layer and qplot for more information on creating a complete plot from multiple components.
> qplot(length, rating, data=movies, geom=c("point", "smooth")) + coord_polar()![]()