Polyarea {shipunov}

Area of the polygon

Description

Calculates area of polygon

Usage

Polyarea(x)

Arguments

x

Polygon vertices: two-column numerical matrix or data frame

Details

Based on vegan::summary.ordihulls().

Value

Numerical vector of length 1.

Author(s)

Alexey Shipunov

See Also

Squares, Hulls, Ellipses

Examples

x <- c(1:9, 8:1) # from ?polygon
y <- c(1, 2*(5:3), 2, -1, 17, 9, 8, 2:9)
Polyarea(cbind(x, y)) # numerical matrix
Polyarea(data.frame(x, y)) # numerical data frame