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MathGroup Archive 1998

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Re: plot coloring



Paul.Hanson@colorado.edu wrote:
> 
> Hola, all;
>   I'm looking for a way to color lines.  Say I have a data set
> {{{x,y},...{xn,yn}},{{x1,y1}....{xn1,yn1}},.....} and I want to plot
> each of the points in the set with different colors.  I've tried using
> Map to change the values of r,g,b but they all change byt the same
> amount, thus, the lines are always the same color.  How do I vary r,g,b
> selectively and uniquely so that I get different colors for each line?
> 

If pts is a list of ordered pairs and colors is a list of GRBColor
expressions of the same length, then with
	
	Transpose[{colors,Map[Point,pts]}]//Graphics//Show 

you should see what you're looking for

Or if you want the lines of different color, try something like

	Transpose[{Rest[colors],Map[Point,Partition[pts,2,1]]}]//Graphics//Show

(I'm using Rest here since Length[Partition[pts,2,1]] =Length[pts]-1 )

Ken Levasseur

PS:  Interested in a on-line course in Mathematica?  Check out
http://www.uml.edu/Dept/Math/m419.html a 3 credit UMass Lowell course
that can be taken from anywhere in the world!



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