plotConvexHull function

Add convex hull for groups of points on scatter plot

The method shows convex hull for groups of points on a scatter plot made using mdaplot() function with cgroup parameter. It will work only if cgroup is a factor.

plotConvexHull(p, lwd = 1, lty = 1, opacity = 0)

Arguments

• p: plot data returned by function mdaplot().
• lwd: thickness of line used to show the hull.
• lty: type of line used to show the hull.
• opacity: of opacity is larger than 0 a semi-transparent polygon is shown over points.

Examples

# adds convex hull with semi-transparent area over two clusters of points

library(mdatools)
data(people)
group <- factor(people[, "Sex"], labels = c("Male", "Female"))

p <- mdaplot(people, type = "p", cgroup = group)
plotConvexHull(p)