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DI   plot.network.setup

Initialize network plot window
 	
	
DESCRIPTION:

	Initializes the axes using the function equal.axis 
        so the resolution of the plot is correct.

USAGE:
	plot.network.setup(nw.obj=new.network, 
	xrange=NULL, yrange=NULL, ...)


REQUIRED ARGUMENTS:

nw.obj
	A network object as created by make.network.obj

OPTIONAL ARGUMENTS:

xrange

	range of x-values for plot

yrange
	range of y-values for plot

...
	other par options for the function, plot

SIDE EFFECTS:
	Opens a graphics device and sets up a plot area.

SEE ALSO:
	equal.axis, plot.network, se.image, image.plot

EXAMPLES:
# The function is currently defined as
function(nw.obj = new.network, xrange = NULL, yrange = NULL, ...)
{
	if(nw.obj$cov.obj$args$lon.lat)
		p.labels <- c("Longitude", "Latitude")
	else p.labels <- c("x", "y")
	xrange <- range(nw.obj$grid$x)
	yrange <- range(nw.obj$grid$y)
	temp <- equal.axis(xrange, yrange)
	plot(temp$x, temp$y, type = "n", xlab = p.labels[1], 
                ylab = p.labels[2], ...)
}