| is.marked {spatstat} | R Documentation |
Generic function to test whether a given object (usually a point pattern or something related to a point pattern) has ``marks'' attached to the points.
is.marked(X, ...)
X |
Object to be inspected |
... |
Other arguments. |
``Marks'' are observations attached to each point of a point pattern.
For example the longleaf dataset contains the locations
of trees, each tree being marked by its diameter;
the amacrine dataset gives the locations of cells
of two types (on/off) and the type of cell may be regarded as a mark attached
to the location of the cell.
Other objects related to point patterns, such as point process models, may involve marked points.
This function tests whether the object X
contains or involves marked points.
It is generic; methods are provided
for point patterns (objects of class "ppp")
and point process models (objects of class "ppm").
Logical value, equal to TRUE if X is marked.
Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf