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MathGroup Archive 2007

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Re: weird behavior when plotting multiple functions in

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76095] Re: [mg76050] weird behavior when plotting multiple functions in
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Wed, 16 May 2007 05:28:54 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200705150859.EAA17134@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Yes, but use

   f[x_]={Sin[x],Cos[x]};
   Plot[Evaluate[f[x]],{x,0,4*Pi}]

and again you will get a blue sine curve and a red cosine curve.

Roman wrote:
> Hello all:
> 
> When I plot
>     Plot[{Sin[x], Cos[x]}, {x, 0, 4*Pi}]
> I get two curves: one blue, one red.
> 
> But when I do
>     f[x_] = {Sin[x], Cos[x]};
>     Plot[f[x], {x, 0, 4*Pi}]
> both curves are blue. It is as if at some level Mathematica does not
> understand that I'm actually plotting two curves at a time, and uses
> the first color specification (blue) for both curves.
> 
> This is particularly annoying when you want to play with plot styles,
> for example filling instructions, like
>     Filling -> {1 -> -1, 2 -> 1}
> which works in the first example but not in the second one.
> 
> Has anyone figured out a workaround for this one?
> 
> Thanks!
> Roman.
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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