spatstat (version 1.41-1)

contour.im: Contour plot of pixel image

Description

Generates a contour plot of a pixel image.

Usage

## S3 method for class 'im':
contour(x, \dots, main,
            axes=FALSE, add=FALSE, clipwin=NULL, show.all=!add, do.plot=TRUE)

Arguments

x

Pixel image to be plotted. An object of class "im".

main

Character string to be displayed as the main title.

axes

Logical. If TRUE, coordinate axes are plotted (with tick marks) around a region slightly larger than the image window. If FALSE (the default), no axes are plotted, and a box is drawn tightly around the image window.

add

Logical. If FALSE, a new plot is created. If TRUE, the contours are drawn over the existing plot.

clipwin

Optional. A window (object of class "owin"). Only this subset of the data will be displayed.

...

Other arguments passed to contour.default controlling the contour plot; see Details.

show.all

Logical value indicating whether to display all plot elements including the main title, bounding box, and (if axis=TRUE) coordinate axis markings. Default is TRUE for new plots and FALSE for added plots.

do.plot

Logical value indicating whether to actually perform the plot.

Value

• none.

Details

This is a method for the generic contour function, for objects of the class "im". An object of class "im" represents a pixel image; see im.object.

This function displays the values of the pixel image x as a contour plot on the current plot device, using equal scales on the $x$ and $y$ axes.

The appearance of the plot can be modified using any of the arguments listed in the help for contour.default. Useful ones include: [object Object],[object Object],[object Object] See contour.default for a full list of these arguments.

The defaults for any of the abovementioned arguments can be reset using spatstat.options("par.contour").

See Also

im.object, plot.im, persp.im

Examples

# an image
   Z <- setcov(owin())
   contour(Z, axes=TRUE)
   contour(Z)