Tests whether a point pattern has “marks” attached to the points.
Point pattern (object of class
String indicating what to do if
“Marks” are observations attached to each point of a point pattern.
For example the
contains the locations of trees, each tree being marked by its diameter;
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.
This function tests whether the point pattern
contains or involves marked points.
It is a method for the generic function
na.action determines what action will be taken
if the point pattern has a vector of marks but some or all of the
NA. Options are
"fatal" to cause a fatal
"warn" to issue a warning and then return
"ignore" to take no action except returning
Logical value, equal to
X is a marked point pattern.
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