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Re: Simple equation won't plot

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  • Subject: [mg82941] Re: [mg82917] Simple equation won't plot
  • From: bsyehuda at
  • Date: Sun, 4 Nov 2007 06:08:35 -0500 (EST)
  • References: <>

Its seems that you copied and paste the code from a pdf source. Sometimes it
happens that the character l is recognized as 1 so Plot was really P1ot
which is meaningless for mathematica.
Your email is quoted below, so you can easily observe this problem.
as for using patterns, you are cordially referred to the documentation

On 11/3/07, Bert Aerts (rm x) <bert.aertsx at> wrote:
> When I type following commands in Mathematica 6.0.1:
> m = 70; a = 0.08; x0 = 5000; g = 9.81;
> x[t_] = x0 - m*Log[Cosh[t*Sqrt[g*a]/Sqrt[m]]]/a;
> P1ot[x[t], {t, 0, 60}]
> I don't get a plot, but instead:
> P1ot[5000 - 875. Log[Cosh[0.105884 t]], {t, 0, 60}]
> How can I get a real plot? I tried [N[x[t]] and Evaluate[x[t]] but nothing
> worked...
> Why is t_ used in the second equation?
> The source of these equations is Ferdinand F. Cap's book "Mathematical
> methods in physics and engineering with Mathematica"

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