raster.x {spatstat} | R Documentation |
Return the x and y coordinates of each pixel in a binary pixel image.
raster.x(w) raster.y(w) raster.xy(w)
w |
A window (an object of class |
The argument 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.
The functions raster.x
and raster.y
return
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.
The function raster.xy
returns a list
with components x
and y
which are numeric vectors of equal length containing the pixel coordinates.
raster.x
and raster.y
return
a matrix of the same dimensions as the pixel grid in w
,
and giving the value of the x (or y) coordinate
of each pixel in the raster.
raster.xy
returns a list with components x
and y
which are numeric vectors of equal length containing the pixel coordinates.
Adrian Baddeley Adrian.Baddeley@csiro.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz
u <- 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)) ## Not run: plot(disc) # approximation to the unit disc