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MathGroup Archive 2002

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RE: how to plot 2 functions in different colors?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33605] RE: [mg33583] how to plot 2 functions in different colors?
  • From: David.Annetts at csiro.au
  • Date: Wed, 3 Apr 2002 01:13:34 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Guojun,

> I can plot two functions in one diagram with 
> plot[{fa[x],fb[x]},{x,1,100}],
> but they are in same color and hard to seperated.  Is there 
> any way to make them in different colors?

Yes there is.

Just supply a list of plot styles, and plot functions are cycled with plot
styles.

For two functions, you can define:-
myStyle = {RGBColor[1, 0, 0], RGBColor[0, 1, 0], RGBColor[0, 0, 1]};

then
Plot[{x, 2x, 3x}, {x, 1, 100}, PlotStyle -> myStyle];

Or, with Graphics`Colors` loaded, you can use:-

Plot[{Sin[x], Cos[x]}, {x, -Pi, Pi}, PlotStyle -> {Red, Blue}, 
    FrameTicks -> {PiScale, Automatic, None, None}];

IMHO, it's usually easier to define a list of styles and use the list rather
than specify individual colours by their names.  One way of defining such a
list is:- 

maxNumberOfCurves = 12;
lst = Range[maxNumberOfCurves]/(maxNumberOfCurves + 1.)
myStyle2 = Hue[#] & /@ lst

There are other methods.

Regards,

Dave.
--------------------------------------------------------
  Dr. David Annetts             EM Modelling Analyst
  Tel: (+612) 9490 5416         CSIRO DEM, North Ryde
  Fax: (+612) 9490 5467         David.Annetts at csiro.au
                 Include "usual_disclaimers"
--------------------------------------------------------


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