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Re: Help

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92300] Re: Help
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sat, 27 Sep 2008 06:49:03 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <gbjmbb$3ah$1@smc.vnet.net>

Rui wrote:

> I'm new in Mathematica. I have version 6.0.3.0.
> I'm trying to create an animation or a plot, something simple. I found
> Animate[].
> I can make it work fine by doing something "like"
> Animate[Plot[Sin[34*x-2*t], {x, 0, 2*pi}], {t, 0, 5} ]
> But if i have my expression stored in a variable i can't...
> a = Sin[34*x-2*t];
> Animate[Plot[a, {x, 0, 2*pi}], {t, 0, 5} ]
> leaves the animation blank.
> 
> I tries all variants I could think of and I always fail. I actually
> wanted to create several animations of expressions i have stored in a
> list, and I could do it one by one manually but I wanted to learn the
> proper way and I'm frustrated already. Any ideas?

Define 'a' as a *function* of the variables 'x' and 't'. Also, pay 
attention to capitalization: pi is not Pi. For instance,

     Clear[a]
     a[a_, t_] := Sin[34*x - 2*t]
     Animate[Plot[a[x, t], {x, 0, 2*Pi}], {t, 0, 5}]

Regards,
-- Jean-Marc



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