# is.connected.ppp

##### Determine Whether a Point Pattern is Connected

Determine whether a point pattern is topologically connected when all pairs of points closer than a threshold distance are joined.

##### Usage

```
# S3 method for ppp
is.connected(X, R, …)
```

##### Arguments

- X
A point pattern (object of class

`"ppp"`

).- R
Threshold distance. Pairs of points closer than

`R`

units apart will be joined together.- …
Ignored.

##### Details

The function `is.connected`

is generic. This is the method for
point patterns (objects of class `"ppp"`

).

The point pattern `X`

is first converted into an abstract graph
by joining every pair of points that lie closer than `R`

units
apart. Then the algorithm determines whether this graph is connected.

That is, the result of `is.connected(X)`

is `TRUE`

if any point in `X`

can be reached from any other point,
by a series of steps between points of `X`

,
each step being shorter than `R`

units in length.

##### Value

A logical value.

##### See Also

##### Examples

```
# NOT RUN {
is.connected(redwoodfull, 0.1)
is.connected(redwoodfull, 0.2)
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*