Determines area of a polygon by triangle method.
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.
polyarea(x, y, d = 1)
x |
X coordinates of vertices. |
y |
Y coordinates of vertices. |
d |
Dimension of array to work along. |
If the optional dim argument is given, then polyarea
works along this dimension of the arrays x and y.
Area(s) of polygon(s).
David Sterratt based on the octave sources by David M. Doolin
x <- c(1, 1, 3, 3, 1) y <- c(1, 3, 3, 1, 1) polyarea(x, y) polyarea(cbind(x, x), cbind(y, y)) ## c(4, 4) polyarea(cbind(x, x), cbind(y, y), 1) ## c(4, 4) polyarea(rbind(x, x), rbind(y, y), 2) ## c(4, 4)
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