"contour"(x, ..., main, axes=FALSE, add=FALSE, col=par("fg"), clipwin=NULL, show.all=!add, do.plot=TRUE)"im".
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.
Ignored if add=TRUE.
FALSE, a new plot is created. If TRUE,
the contours are drawn over the existing plot.
colourmap object.
"owin").
Only this subset of the data will be displayed.
contour.default
controlling the contour plot; see Details.
axis=TRUE) coordinate axis markings.
Default is TRUE for new plots and FALSE for added plots.
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:
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").
If col is a colour map (object of class "colourmap",
see colourmap) then the contours will be plotted in
different colours as determined by the colour map.
The contour at level z will be plotted
in the colour col(z) associated with this level in the colour map.
im.object,
plot.im,
persp.im
# an image
Z <- setcov(owin())
contour(Z, axes=TRUE)
contour(Z)
co <- colourmap(rainbow(100), range=c(0,1))
contour(Z, col=co, lwd=2)
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