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weird behavior when plotting multiple functions in 6.0

• To: mathgroup at smc.vnet.net
• Subject: [mg76050] weird behavior when plotting multiple functions in 6.0
• From: Roman <rschmied at gmail.com>
• Date: Tue, 15 May 2007 04:59:14 -0400 (EDT)

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.

• Follow-Ups:
  • Re: weird behavior when plotting multiple functions in
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: weird behavior when plotting multiple functions in 6.0
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>