Re: Simple equation won't plot
- To: mathgroup at smc.vnet.net
- Subject: [mg82950] Re: [mg82917] Simple equation won't plot
- From: DrMajorBob <drmajorbob at bigfoot.com>
- Date: Sun, 4 Nov 2007 06:13:13 -0500 (EST)
- References: <17144801.1194080632831.JavaMail.root@m35>
- Reply-to: drmajorbob at bigfoot.com
You misspelled Plot (with the numeral 1 in place of the letter l). (Whoever decided the two should look so nearly identical is roasting in = hades, I hope.) m = 70; a = 0.08; x0 = 5000; g = 9.81; x[t_] = x0 - m*Log[Cosh[t*Sqrt[g*a]/Sqrt[m]]]/a Plot[x[t], {t, 0, 60}] works just fine. The second line (a) isn't an equation and (b) uses t_ on the left to define a pattern named t. Bobby On Sat, 03 Nov 2007 03:27:03 -0500, Bert Aerts (rm x) <bert.aertsx at advalvasx.be> 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" > > > -- DrMajorBob at bigfoot.com