Mathematica [Mathematica]Frustratedhow to color a plot according to the values?

[hanson]

Hi all.
I have been searching over the web for some time, kind of frustrated...
I would like to plot the contourplot of a function, and I would like the contourplot to be colored.
The rule is that...the negative values should be blue in colors and the positive values should be red in colors, but I also want some gradient between these two limits...
I suppose this can be quite easily done, but I still don't know how to do that...
Anyone knows? Please help. Thanks.

 

[Winzer]

Try playing with the contour option:
contour-># of contour lines
and contourstyle

they should be in the help context

 

[signerror]

ColorFunction

http://documents.wolfram.com/mathematica/functions/ColorFunction

I can't remember the syntax (haven't had a Mathematica license in years), but you want something like ColorFunction -> (RGBColor[1.0#, 0.0, (1.0-1.0#)]&) or similar - you can fiddle with the constants to change the parametric variation, even make it nonlinear if you want.

 

[hanson]

Thanks for the replies!
I have found a user-written Mathematica notebook which do exactly what i want. Thanks.