Computes and draws the convex hull of the set of points specified.
Usage
ternary_hull(x, y, z, ...)
# S4 method for numeric,numeric,numeric
ternary_hull(x, y, z, ...)
# S4 method for ANY,missing,missing
ternary_hull(x, y, z, ...)
Arguments
- x, y, z
A
numeric
vector giving the x, y and z ternary coordinates of a set of points. Ify
andz
are missing, an attempt is made to interpretx
in a suitable way (seegrDevices::xyz.coords()
).- ...
Further arguments to be passed to
graphics::polygon()
.
See also
grDevices::chull()
, graphics::polygon()
Other statistics:
ternary_ellipse()
,
ternary_mean()
Examples
## Compositional data
coda <- data.frame(
X = c(96, 49, 57, 92, 62, 85, 75, 76, 30, 36,
55, 93, 78, 10, 50, 69, 50, 91, 13, 24),
Y = c(59, 90, 18, 99, 80, 22, 74, 43, 68, 80,
30, 84, 84, 48, 79, 53, 32, 91, 19, 48),
Z = c(33, 88, 7, 58, 81, 16, 48, 91, 85, 12,
94, 81, 32, 39, 39, 32, 65, 35, 4, 12)
)
## Convex hull
ternary_plot(coda, panel.first = ternary_grid(5, 10))
ternary_hull(coda, border = "red")