R: Determines area of a polygon by triangle method.
polyarea
R Documentation
Determines area of a polygon by triangle method.
Description
Determines area of a polygon by triangle method. The variables
x and y define the vertex pairs, and must therefore
have the same shape. They can be either vectors or arrays. If
they are arrays then the columns of x and y are
treated separately and an area returned for each.
Usage
polyarea(x, y, d = 1)
Arguments
x
X coordinates of verticies.
y
Y coordinates of verticies.
d
Dimension of array to work along.
Details
If the optional dim argument is given, then polyarea
works along this dimension of the arrays x and y.
Value
Area(s) of polygon(s).
Author(s)
David Sterratt based on the octave sources by David M. Doolin