Re: color in ListContourPlot

*Subject*: [mg2250] Re: [mg2230] color in ListContourPlot*From*: ptk at imada.ou.dk (Peder Thusgaard Ruhoff)*Date*: Wed, 18 Oct 1995 05:56:03 GMT*Approved*: usenet@wri.com*Distribution*: local*Newsgroups*: wri.mathgroup*Organization*: Wolfram Research, Inc.*Sender*: daemon at wri.com ( )

On Tue, 17 Oct 1995, Elizabeth Kraemer <kraemer at service1.uky.edu> wrote: > > I want to do a ListContourPlot with a specific color range (from > white/purple to red). If I just use "Hue", the high and low values are red. > I've got a lot of contours, so I want to avoid having to define a color > individually for each one. I'm running Mathematica on a Windows machine. > Thanks for the help! -Beth > > Dear Beth, You can use the option ColorFunction. First let us generate an array of numbers In[1]:= a = Table[ Sin[x Sin[y Cos[x]]], {x, -Pi, Pi, Pi/20}, {y, -Pi, Pi, Pi/20} ]; We can get a contour plot in the following way In[2]:= ListContourPlot[a] Out[2]= -ContourGraphics- Now, to change the coloring of the contours we can do the following In[3]:= ListContourPlot[a, ColorFunction -> (GrayLevel[0.5 + #/2]&)] Out[3]= -ContourGraphics- which on my B/W monitor makes the plot much "lighter". I guess you can do the same in your problem with something like ColorFunction -> (Hue[#/2]&) Of course, if you don't like the pure function approach you can define a function, e.g. In[4]:= MyOwnColorFunction[val_] := Hue[0.5 + val/2] In[5]:= ListContourPlot[a, ColorFunction -> MyOwnColorFunction] Out[5]= -ContourGraphics- Good luck, Peder ------------------------------------------------------------------------------ Peder Thusgaard Ruhoff Phone: (+45) 66 15 86 96, ext. 2411 Dept. of Mathematics and Computer Science Fax: (+45) 65 93 26 91 Odense University, Campusvej 55 Email: ptk at imada.ou.dk DK-5230 Odense M, DENMARK "It is important for him who wants to discover not to confine himself to one chapter of science, but to keep in touch with various others." - Jacques Hadamard ------------------------------------------------------------------------------