Dear Pep,
see
http://www.r-bloggers.com/define-intermediate-color-steps-for-colorramppalette/
Maybe that is what you're after.
Regards,
Tim
On 25/11/2011 14:03, PepET wrote:
Dear subscribes,
I have been looking but could not find the exact answer for my question,
which may seem really from a newbie....
I have several rasters and I want to plot them using a color gradient / ramp
going from red to grey untill 0 and from grey to green from 0 onwards.
I have managed to create a ramp:
#piba is a raster
myramp<-colorRampPalette( c("red", "white","green"), space="rgb",
breaks=c(cellStats (piba,min),0,cellStats (piba,max)))
but the problem there is that I want negative cells to go from red to white
and positive cells from white to green. Using this ramp I do not enshure
that. I also used breaks option in the plot, but then the display is a
single color.
Any help? THANK YOU!
Pep
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Tim Appelhans
Department of Geography
Environmental Computer Sciences
Philipps Universität Marburg
Deutschhausstraße 12
35032 Marburg (Paketpost: 35037 Marburg)
Germany
Tel +49 (0) 6421 28-25957
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