Area of a Window
Computes the area of a window
area(w) ## S3 method for class 'owin' area(w) ## Default S3 method: area(w) ## S3 method for class 'owin' volume(x)
If the window w is of type "rectangle" or "polygonal",
the area of this rectangular window is computed by analytic geometry.
If w is of type "mask"
the area of the discrete raster approximation of the window is
computed by summing the binary image values and adjusting for
pixel size.
The function volume.owin is identical to area.owin
except for the argument name. It is a method for the generic function
volume.
A numerical value giving the area of the window.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
w <- unit.square()
area(w)
# returns 1.00000
k <- 6
theta <- 2 * pi * (0:(k-1))/k
co <- cos(theta)
si <- sin(theta)
mas <- owin(c(-1,1), c(-1,1), poly=list(x=co, y=si))
area(mas)
# returns approx area of k-gon
mas <- as.mask(square(2), eps=0.01)
X <- raster.x(mas)
Y <- raster.y(mas)
mas$m <- ((X - 1)^2 + (Y - 1)^2 <= 1)
area(mas)
# returns 3.14 approxPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.