Re: Help

*To*: mathgroup at smc.vnet.net*Subject*: [mg92303] Re: Help*From*: Norbert Marxer <marxer at mec.li>*Date*: Sat, 27 Sep 2008 06:49:37 -0400 (EDT)*References*: <gbjmbb$3ah$1@smc.vnet.net>

On 27 Sep., 00:05, Rui <rui.r... at gmail.com> 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? Hello 1. You should use Pi (instead of pi) 2. You should define a function a[t] oder a[t,x]. The following should work: Clear[a, x, t]; a[t_] = Sin[34*x - 2*t]; Animate[Plot[a[t], {x, 0, 2*Pi}], {t, 0, 5}] Or Clear[a, x, t]; a[t_, x_] = Sin[34*x - 2*t]; Animate[Plot[a[t, x], {x, 0, 2*Pi}], {t, 0, 5}] Best Regards Norbert Marxer