area.owin
From spatstat v1.16-2
by Adrian Baddeley
Area of a Window
Computes the area of a window
Usage
area.owin(w)
Arguments
Details
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.
Value
- A numerical value giving the area of the window.
See Also
Examples
w <- unit.square()
area.owin(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.owin(mas)
# returns approx area of k-gon
mas <- as.mask(w, eps=0.01)
X <- raster.x(mas)
Y <- raster.y(mas)
mas$m <- ((X - 0.5)^2 + (Y - 0.5)^2 <= 1)
area.owin(mas)
# returns 3.14 approx
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