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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: [mg76100] Re: weird behavior when plotting multiple functions in 6.0
  • From: yusung at wolfram.com
  • Date: Wed, 16 May 2007 05:31:28 -0400 (EDT)
  • References: <f2btov$iga$1@smc.vnet.net>

Dear Roman,

It is due to the Hold attribute of Plot functions. Try:
Plot[Evaluate[f[x]], {x, 0, 4Pi}]

Yu-Sung Chang
Kernel Technology
Wolfram Research, Inc.

On May 15, 4:16 am, Roman <rschm... at gmail.com> 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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