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spatstat.geom (version 3.3-3)

is.marked: Test Whether Marks Are Present

Description

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.

Usage

is.marked(X, ...)

Value

Logical value, equal to TRUE if X is marked.

Arguments

X

Object to be inspected

...

Other arguments.

Author

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner rolfturner@posteo.net

Details

``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").

See Also

is.marked.ppp, is.marked.ppm