hi
> 1. How do I get a color key on the plot?
its possible, but you'll have to do it by hand. take a look at
filled.contour() and see if that does the sort of key you are after. If so,
look at the filled.contour() code (e.g., by typing
"filled.contour<return>")
for an example of how to produce such a key using the layout() and rect()
functions.
if you want a quick, dirty fix, you can piggy-back on the filled.contour()
code. for example:
data(volcano)
filled.contour(volcano, color = terrain.colors,
plot.axes={ image(volcano, add=T,
col=terrain.colors(21));
axis(1); axis(2); })
but you would have to be careful to coordinate the colours used by
filled.contour() and the colours used by image(), and this is not a
long-term solution, and figuring out how it works may be just as much work
as writing your own function :)
> 2. What I'd like to have is 0=white, 1=red, -1=blue (or any other
color),
> and numbers in between represented by different shade (e.g., 0.1 would be
> light pink, -0.1 would be light blue, etc.). Is this possible?
you can specify an arbitrary range of colours using the rgb() function. for
example, try
plot(1:10)
points(1:10, col=rgb(10:1/10, rep(0,10), 1:10/10))
or
data(volcano)
image(volcano, col=rgb(10:1/10, rep(0,10), 1:10/10))
hope that is of some help
paul
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