R: Test Whether Marks Are Present

is.marked {spatstat} | R Documentation

## 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, ...)

### Arguments

`X` | Object to be inspected
`...` | Other arguments.

### 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"`).

### Value

Logical value, equal to `TRUE` if `X` is marked.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

### See Also

`is.marked.ppp`, `is.marked.ppm`

[Package spatstat version 1.54-0 Index]