Hi Claudia, It's quite easy to do this using ggplot, although you get exactly the same appearance as filled.contour (hopefully in the next version). Have a look at ggtile and scgradient.
Regards, Hadley On 1/4/07, Claudia Tebaldi <[EMAIL PROTECTED]> wrote: > Dear R-helpers, > > I'm plotting geophysical data in the form of contours using > "filled.contour". The display would be much more effective if the areas > with negative values could be color coded > by -- say -- "cold colors" in the range of blue to green, and conversely > the areas with positive values got plotted with "warm colors", from yellow > to red. > Right now if I use a palette spanning the spectrum I need the entire range > is associated with the actual range of the data, which can be positively > or negatively skewed, and as a result the position of the zero is totally > arbitrary. > I'm wondering if someone out there has come up with a clever way to set > the color scale accordingly, as a function of the actual range of the > values in the matrix that is being plotted. Ideally, it would be neat to > still use the entire spectrum, but sampling differently the cold and warm > subsets accordingly to the extent of the negative and positive values in > the data. > > Also, when I try to play around in an ad hoc fashion with the palette I > often get funny results in the legend, with color-scale wrapping or blank > cells at one of the extremes. I cannot hack effectively the code of the > filled.contour function, obviously... > > > Thank you in advance for your help > & happy new year > > claudia tebaldi > > > > > > > > > > > > -- > Claudia Tebaldi > ISSE/CGD/IMAGe > http://www.image.ucar.edu/~tebaldi > > currently visiting > Center for Environmental Science and Policy > Stanford University > tel: (650) 724-9261 > skype: claudia.tebaldi > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.