area.owin
From spatstat v1.64-1
by Adrian Baddeley
Area of a Window
Computes the area of a window
Usage
area(w) # S3 method for owin
area(w)
# S3 method for default
area(w)
# S3 method for owin
volume(x)
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.
The function volume.owin
is identical to area.owin
except for the argument name. It is a method for the generic function
volume
.
Value
A numerical value giving the area of the window.
See Also
Examples
# NOT RUN {
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 approx
# }
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