Hello, I'm having some trouble getting things to look as I want with
filled.contour.
1. My first issue is that I am unable to add line segments to my plot where
I want them. Using the rug pattern example:
x <- y <- seq(-4*pi, 4*pi, len = 27);
r <- sqrt(outer(x^2, y^2, "+"));
filled.contour(cos(r^2)*exp(-r/(2*pi)));
segments(0.2,0.2,1,0.2);
The line segment is not found in relation to the x-axis but is seemingly
squished over by the color bar.
If I try to achieve the line this way:
filled.contour(cos(r^2)*exp(-r/(2*pi)),plot.axes={lines(c(0.2,1),c(0.2,0.2))})
Now when I add the axis back it is misaligned.
axis(1).
2. Secondly I'm finding the literature difficult to understand on how to
make a nice color scheme. Below is a nice scheme I found from an example,
except I don't understand why the scale seems to cycle into blue again for
larger values, even though I think I am setting the number of levels of
colors and contour levels to be equal. Basically I want reds for the
highest values and blues for the lowest:
filled.contour(cos(r^2)*exp(-r/(2*pi)),nlevels=25,col=hsv(h=seq(from=.7,to=0,length=25)))
3. I'm used to working with matlab where it was simple to make the color
scale the same on multiple figures using caxis(). However I don't see this
option for filled.contour (possibly it exists for levelplot() but I was
having even less success understanding that one). I only see the option to
set the number of levels which doesn't really accomplish what I want for
plots that are going to have widely varying limits.
Thanks very much for any help, John.
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