[R] How to reverse colors in filled.contour?

[Bert Gunter]

from the Help file:

"color.palette:  a color palette function to be used to assign colors in the
plot."

so color = function(x)rev(heat.colors(x))

should do it.

-- Bert Gunter
Genentech

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Ravi Varadhan
Sent: Tuesday, March 18, 2008 2:52 PM
To: r-help at stat.math.ethz.ch
Subject: [R] How to reverse colors in filled.contour?

Hi,

 

I am plotting values of log(hazards ratio) as a function of two predictors,
using the plotting function filled.contour().  Here is a simple simulated
example of this:

 

x <- seq(0,1, length=20)

 

y <- seq(0,1, length=20)

 

z <- outer(x,y, function(x,y) x^2 + y^2 )

 

zmat <- matrix( rexp(n=400, rate = z+0.001), 20, 20)

 

filled.contour(x, y, log(zmat), xlab="X", ylab="Y", color=heat.colors,
main="log-Hazard ratios for different X & Y cutoffs")

 

Here lower hazard-ratios are reddish and higher values are lighter.  I would
like to reverse the color palette "heat.colors" such that higher hazard
ratios are reddish and lower values are lighter.  Can any one suggest an
easy way to do this?  

 

Also, suggestions on better ways to display this information would be
greatly appreciated.

 

Thanks very much.

 

Best,

Ravi.

----------------------------------------------------------------------------
-------

Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology 

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan at jhmi.edu

Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html

 

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