Draw a function as a continuous curve — geom_functionComputes and draws a function as a continuous curve. This makes it easy to superimpose a function on top of an existing plot. The function is called with a grid of evenly spaced values along the x axis, and the results are drawn (by default) with a line. geom_function( mapping = NULL, data = NULL, stat = "function", position = "identity", ..., arrow = NULL, arrow.fill = NULL, lineend = "butt", lin
