Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum: 'some trouble with DSolve' topicStudent Support Forum > General > Archives > "some trouble with DSolve"

< Previous Comment | Next Comment >Help | Reply To Comment | Reply To Topic
Author Comment/Response
VR
04/25/13 00:31am

In Response To 'Re: some trouble with DSolve'
---------
Dear Bill,

since you have answered PDE question, I'm sending my problem to you personally:

Wave equation without boundary and initial conditions

DSolve[D[c^2*u[x, t], {x, 2}]
- D[u[x, t], {t, 2}] == 0, u[x, t], {x, t}]

gives well known solution

C[1][t - x/Sqrt[c^2]] + C[2][t + x/Sqrt[c^2]]

However, if I add these conditions

DSolve[{D[c^2*u[x, t], {x, 2}]
- D[u[x, t], {t, 2}] == 0,
u[x, 0] == Sin[Pi*x/L],
{D[u[x, t], t] /. t -> 0} == 0,
u[0, t] == 0, u[L, t] == 0}, u[x, t], {x, t}]

there is no solution, DSolve is just repeated without any error messages.

Where is mistake?


URL: ,

Subject (listing for 'some trouble with DSolve')
Author Date Posted
some trouble with DSolve darin 04/18/13 08:43am
Re: some trouble with DSolve Bill Simpson 04/18/13 9:45pm
Re: Re: some trouble with DSolve darin 04/19/13 09:03am
Re: Re: some trouble with DSolve VR 04/25/13 00:31am
Re: Re: Re: some trouble with DSolve Bill Simpson 04/25/13 4:12pm
< Previous Comment | Next Comment >Help | Reply To Comment | Reply To Topic