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MathGroup Archive 2007

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Re: weird behavior when plotting multiple functions in 6.0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76075] Re: weird behavior when plotting multiple functions in 6.0
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 16 May 2007 05:18:39 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f2btov$iga$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

and when you say
f[x_] = {Sin[x], Cos[x]};
Plot[Evaluate[f[x]], {x, 0, 4*Pi}]
the curves again red and blue, because Plot[]
has the attribute HoldAll, and so it can't see
that f[x] results a list of functions instead of a
single one. In version 6.0 Plot[] has a new option

Plot[f[x], {x, 0, 4*Pi}, Evaluated -> True]

that will also fix the problem.

Regards
   Jens

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.
> 
> 


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