is.multitype(X, ...)TRUE if X is multitype.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, and that the
marks are a factor.
For example, the amacrine
dataset is multitype (there are two types of cells, on and off),
but the longleaf dataset is not multitype
(the marks are real numbers).
This function is generic; methods are provided
for point patterns (objects of class "ppp")
and point process models (objects of class "ppm").
is.multitype.ppp,
is.multitype.ppm