Computes, within each panel, a stacking index y for every case sharing
the same x value. Exported so that other developers can extend it.
Format
A ggplot2::ggproto() object inheriting from ggplot2::Stat.
Computes, within each panel, a stacking index y for every case sharing
the same x value. Exported so that other developers can extend it.
A ggplot2::ggproto() object inheriting from ggplot2::Stat.