spatstat.geom (version 2.4-0)

unmark: Remove Marks

Description

Remove the mark information from a spatial dataset.

Usage

unmark(X)
 # S3 method for ppp
unmark(X)
 # S3 method for splitppp
unmark(X)
 # S3 method for psp
unmark(X)
 # S3 method for ppx
unmark(X)

Value

An object of the same class as X

with any mark information deleted.

Arguments

X

A point pattern (object of class "ppp"), a split point pattern (object of class "splitppp"), a line segment pattern (object of class "psp") or a multidimensional space-time point pattern (object of class "ppx").

Author

Adrian Baddeley and Rolf Turner

Details

A `mark' is a value attached to each point in a spatial point pattern, or attached to each line segment in a line segment pattern, etc.

The function unmark is a simple way to remove the marks from such a dataset.

See Also

ppp.object, psp.object

Examples

  data(lansing)
  hicks <- lansing[lansing$marks == "hickory", ]

  # plot(hicks)  # still a marked point pattern, but only 1 value of marks
  # plot(unmark(hicks)) # unmarked