is.marked.ppp

From spatstat v1.5-4 by Adrian Baddeley

Test Whether A Point Pattern is Marked

Tests whether a point pattern has ``marks'' attached to the points.

Keywords: spatial

Usage

is.marked.ppp(X, na.action="warn", ...)

Arguments

X: Point pattern (object of class "ppp")
na.action: String indicating what to do if NA values are encountered amongst the marks. Options are "warn", "fatal" and "ignore".
...: Ignored.

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.

This function tests whether the point pattern X contains or involves marked points. It is a method for the generic function is.marked.

The argument na.action determines what action will be taken if the point pattern has a vector of marks but some or all of the marks are NA. Options are "fatal" to cause a fatal error; "warn" to issue a warning and then return TRUE; and "ignore" to take no action except returning TRUE.

Value

Logical value, equal to TRUE if X is a marked point pattern.

Examples

data(cells)
   is.marked(cells)  #FALSE
   data(longleaf)
   is.marked(longleaf) #TRUE

Documentation reproduced from package spatstat, version 1.5-4, License: GPL version 2 or newer

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