Coord

Facetting a plot by a variable produce multiple, smaller charts, one for each value of that variable

gg.coord.cart(flip)

This is the default, cartesian coordinate system used to render charts. Setting the parameter flip to true will flip the x- and y- axis.

gg.coord.polar(flip)

Polar coordinate system for rendering charts. This can be used to produce pie charts, polar scatter plots, star charts, etc. When flip is false, the x-values will be mapped to angle, and y-values will be mapped to radius. Setting flip to true reverses the mapping.