Plot using DSolve HELP
- To: mathgroup at smc.vnet.net
- Subject: [mg104388] Plot using DSolve HELP
- From: "Becky" <noslowski at comcast.net>
- Date: Fri, 30 Oct 2009 02:17:29 -0500 (EST)
I have a problem with what I am showing below.
Step one is my equation.
eq = i * v[t]/r +c v'[t]
Step two I want to solve it, using DSolve, and put my values in as shown.
Please note, that "i= 0", and my IC is v[0]== -70.
sol=v[t]/.DSolve[{eq/.{c->3, i->0, r->2.5} ,v[0]==-70}, v[t], t]
{-70 *-0.133333 t}
The results are shown above.
Thus next step is to plot it.
p1=Plot[sol,{t,-20,140}]
My problem is that I get a line from -70 on the vertical axis going in a
curve up to the horizontal axis out to 140. The vertical axis is "v" and
the horizontal is "t".
What am I doing wrong?
Thanks
Jake
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