raster.x(w)
raster.y(w)"owin")
of type "mask" representing a binary pixel image.w,
and giving the value of the $x$ (or $y$) coordinate
of each pixel in the raster.w should be a window (an object of class
"owin", see owin.object for details).
A window of type "mask" represents a binary pixel image.
This function returns a matrix of the same dimensions as the
binary pixel image itself, with entries giving the $x$ coordinate
(for raster.x) or $y$ coordinate (for raster.y)
of each pixel in the image.owin,
as.masku <- owin(c(-1,1),c(-1,1)) # square of side 2
w <- as.mask(u, eps=0.01) # 200 x 200 grid
X <- raster.x(w)
Y <- raster.y(w)
disc <- owin(c(-1,1), c(-1,1), mask=(X^2 + Y^2 <= 1))
plot(disc)
# approximation to the unit discRun the code above in your browser using DataLab