| is.connected.ppp {spatstat.geom} | R Documentation |
Determine Whether a Point Pattern is Connected
Description
Determine whether a point pattern is topologically connected when all pairs of points closer than a threshold distance are joined.
Usage
## S3 method for class 'ppp'
is.connected(X, R, ...)
Arguments
X |
A point pattern (object of class |
R |
Threshold distance. Pairs of points closer than |
... |
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.
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner rolfturner@posteo.net and Ege Rubak rubak@math.aau.dk
See Also
Examples
is.connected(redwoodfull, 0.1)
is.connected(redwoodfull, 0.2)