# raster.x

From spatstat v1.28-1
by Adrian Baddeley

##### Cartesian Coordinates for a Pixel Raster

Return the $x$ and $y$ coordinates of each pixel in a binary pixel image.

##### Usage

```
raster.x(w)
raster.y(w)
raster.xy(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.
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.

##### Value

`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.

##### 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
```

*Documentation reproduced from package spatstat, version 1.28-1, License: GPL (>= 2)*

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