raster.x
From spatstat v1.6-2
by Adrian Baddeley
Cartesian Coordinates for a Pixel Raster
Returns a matrix giving the $x$ (or $y$) coordinates of each pixel in a binary pixel image.
- Keywords
- spatial
Usage
raster.x(w)
raster.y(w)
Arguments
- w
- A window (an object of class
"owin"
) of type"mask"
representing a binary pixel image.
Details
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.
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.
Value
- 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.
synopsis
raster.x(w)
See Also
Examples
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))
plot(disc)
# approximation to the unit disc
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