# inside.owin

From spatstat v1.3-4
by Adrian Baddeley

##### Test Whether Points Are Inside A Window

Test whether points lie inside or outside a given window.

- Keywords
- spatial

##### Usage

`inside.owin(x, y, w)`

##### Arguments

##### Details

This function tests whether each of the points
`(x[i],y[i])`

lies inside or outside
the window `w`

and returns `TRUE`

if it is inside.
The boundary of the window is treated as being inside.

If `w`

is of type `"rectangle"`

or
`"polygonal"`

, the algorithm uses analytic geometry
(the discrete Stokes theorem).
Computation time is linear in the number of points
and (for polygonal windows) in the number of vertices of the
boundary polygon. Boundary cases are correct to single
precision accuracy.
If `w`

is of type `"mask"`

then the
pixel closest to `(x[i],y[i])`

is tested. The
results may be incorrect for points lying within
one pixel diameter of the window boundary.

##### Value

- Logical vector whose
`i`

th entry is`TRUE`

if the corresponding point`(x[i],y[i])`

is inside`w`

.

##### See Also

##### Examples

```
library(spatstat)
# hexagonal window
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))
plot(mas)
# random points in rectangle
x <- runif(30,min=-1, max=1)
y <- runif(30,min=-1, max=1)
ok <- inside.owin(x, y, mas)
points(x[ok], y[ok])
points(x[!ok], y[!ok], pch="x")
```

*Documentation reproduced from package spatstat, version 1.3-4, License: GPL version 2 or newer*

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