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.
## S3 method for class 'ppp' is.connected(X, R, ...)
X |
A point pattern (object of class |
R |
Threshold distance. Pairs of points closer than |
... |
Ignored. |
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.
A logical value.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk
is.connected(redwoodfull, 0.1) is.connected(redwoodfull, 0.2)
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