spatstat (version 1.36-0)

plot.listof: Plot a List of Things

Description

Plots a list of things

Usage

## S3 method for class 'listof':
plot(x, \dots, main, arrange=TRUE,
   nrows=NULL, ncols=NULL, main.panel=NULL, mar.panel=c(2,1,1,2),
   panel.begin=NULL, panel.end=NULL, panel.args=NULL, plotcommand="plot",
   adorn.left=NULL, adorn.right=NULL, adorn.top=NULL, adorn.bottom=NULL,
   adorn.size=0.2, equal.scales=FALSE)

Arguments

x

An object of the class "listof". Essentially a list of objects.

...

Arguments passed to plot when generating each plot panel.

main

Overall heading for the plot.

arrange

Logical flag indicating whether to plot the objects side-by-side on a single page (arrange=TRUE) or plot them individually in a succession of frames (arrange=FALSE).

nrows,ncols

Optional. The number of rows/columns in the plot layout (assuming arrange=TRUE). You can specify either or both of these numbers.

main.panel

Optional. A character string, or a vector of character strings, giving the headings for each of the objects.

mar.panel

Value of the graphics parameter mar controlling the size of the margins outside each plot panel. See the help file for par.

panel.begin,panel.end

Optional. Functions that will be executed before and after each panel is plotted. See Details.

panel.args

Internal use only.

plotcommand

Optional. Character string containing the name of the command that should be executed to plot each panel.

adorn.left,adorn.right,adorn.top,adorn.bottom

Optional. Functions (with no arguments) that will be executed to generate additional plots at the margins (left, right, top and/or bottom, respectively) of the array of plots.

adorn.size

Relative width (as a fraction of the other panels' widths) of the margin plots.

equal.scales

Logical value indicating whether the components should be plotted at (approximately) the same physical scale.

Value

• Null.

Error messages

If the error message Figure margins too large occurs, ensure that equal.scales=FALSE and increase the values of mar.panel.

Details

This is the plot method for the class "listof".

An object of class "listof" (defined in the base R package) represents a list of objects, all belonging to a common class. The base R package defines a method for printing these objects, print.listof, but does not define a method for plot. So here we have provided a method for plot.

In the spatstat package, various functions produce an object of class "listof", essentially a list of spatial objects of the same kind. These objects can be plotted in a nice arrangement using plot.listof. See the Examples.

The arguments panel.begin and panel.end may be functions that will be executed before and after each panel is plotted. They will be called as panel.begin(i, y, main=main.panel[i]) and panel.end(i, y, add=TRUE).

Alternatively, panel.begin and panel.end may be objects of some class that can be plotted with the generic plot command. They will be plotted before and after each panel is plotted.

If all entries of x are pixel images, the function image.listof is called to control the plotting. The arguments equal.ribbon and col can be used to determine the colour map or maps applied.

If equal.scales=FALSE (the default), then the plot panels will have equal height on the plot device (unless there is only one column of panels, in which case they will have equal width on the plot device). This means that the objects are plotted at different physical scales, by default.

If equal.scales=TRUE, then the dimensions of the plot panels on the plot device will be proportional to the spatial dimensions of the corresponding components of x. This means that the objects will be plotted at approximately equal physical scales. If these objects have very different spatial sizes, the plot command could fail (when it tries to plot the smaller objects at a tiny scale), with an error message that the figure margins are too large.

The objects will be plotted at exactly equal physical scales, and exactly aligned on the device, under the following conditions:

• every component ofxis a spatial object whose position can be shifted byshift;
• panel.beginandpanel.endare eitherNULLor they are spatial objects whose position can be shifted byshift;
• adorn.left,adorn.right,adorn.topandadorn.bottomare allNULL.

See Also

print.listof, contour.listof, image.listof, density.splitppp

Examples

# Multitype point pattern
 data(amacrine)
 plot(D <- density(split(amacrine)))
 plot(D, main="", equal.ribbon=TRUE,
      panel.end=function(i,y,...){contour(y, ...)})

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