plot.ppp

0th

Percentile

plot a Spatial Point Pattern

Plot a two-dimensional spatial point pattern

Keywords
spatial
Usage
plot.ppp(x, main, ..., chars, cols, use.marks=TRUE, add=FALSE, maxsize)
Arguments
x
The spatial point pattern to be plotted. An object of class "ppp", or data which can be converted into this format by as.ppp().
main
text to be displayed as a title above the plot.
...
extra arguments that will be passed to the plotting functions plot.default (see par for possible options) or s
chars
the plotting characters which should be used to represent the points of different types, in the case of a multitype point pattern.
cols
the colours which should be used to plot the points of different types, in the case of a multitype point pattern.
use.marks
logical flag; if TRUE, plot points using a different plotting symbol for each mark; if FALSE, only the locations of the points will be plotted, using points().
add
logical flag; if TRUE, just the points are plotted, over the existing plot. A new plot is not created, and the window is not plotted.
maxsize
the maximum radius of the circles plotted. If x is a marked point pattern with numerical marks, the marks are plotted as circles with maximum radius maxsize (in the same units as the coordinates of the point
Details

This is the plot method for point pattern datasets (of class "ppp", see ppp.object).

First the observation window x$window is plotted using plot.owin. Then the locations of the points are plotted. If the points do not have marks (i.e. x$marks is absent) or if use.marks = FALSE, then the locations of the points will be plotted using a single plot character. This character can be changed by the extra argument pch; see the examples.

For a marked point pattern (where x$marks is not null) each point will be represented by a graphical symbol plotted at the location of the point. The graphical representation of the marks depends on their storage mode: [object Object],[object Object],[object Object] If the arguments chars and/or cols are supplied, they should be vectors of the same length as sort(unique(x$marks)), and then the $i$th smallest mark will be plotted using character chars[i] and colour cols[i].

The argument cols is incompatible with the generic plot argument col. If both are given, an error is generated and no plot is produced.

Value

  • NULL, or a vector giving the correspondence between mark values and plotting characters.

See Also

ppp.object, plot, par, points, plot.owin, symbols

Aliases
  • plot.ppp
Examples
library(spatstat)

   data(cells)
   plot(cells)

   # multitype 
   data(lansing)
   plot(lansing)

   # marked by a real number
   data(longleaf)
   plot(longleaf)

   # just plot the points
   plot(longleaf, use.marks=FALSE)
   plot(unmark(longleaf)) # equivalent

   # controlling COLOURS
   plot(cells, col="blue")
   plot(lansing, cols=c("black", "yellow", "green", "pink",
                        "blue","red","white")
   plot(longleaf, fg="blue")

   # use selected plot characters
   lma <- sort(unique(longleaf$marks))
   adult <- ifelse(lma >= 30, "o", "+")
   plot(longleaf, chars = adult)

   # make the plotting symbols larger (for publication at reduced scale)
   plot(cells, cex=2)
Documentation reproduced from package spatstat, version 1.4-3, License: GPL version 2 or newer

Community examples

Looks like there are no examples yet.