Recent content by vatant

Say you have logged time T = [T1,T2,T3...TN] over time values t = [t1,t2,t3,...tN] now, if you do a plot of T vs t, you would get a curve. If all goes well, your plot may represent a function, say like Newton's law of cooling ..some exponential form may be available. Now, a continuous function...

my problem as posted earlier is similar to your example with a "+" sign in front of the second term with the following conditons. say: u(0,t)=0 dudt(0,t)=0 dudz(0,t)=-pi du2dz2(0,t)=0 If atleast your code is working, do you think these boundary conditons give any approrpriat result...

Not sure abt the working I am not sure if the code with a changed "sign" actually works alrite? If you see your solution, with a + and - sign for the second term, the results look similar..and i tried different Mathematica versions to test the code..the code just doesn't work. It says, ND solve...

Hey there: The code is essentially the same code you put in. I just copied and pasted it in 5.2 or 5.0 ..and it gives me an error saying the input is not a differential equation and beeps. Its strange that I dint the error before the change in sign. In my version of 5.0 or 5.2 your...

Error I have a question regarding Mathematica 5.2 I got an error: NDSolve::ndode: Input is not an ordinary differential equation. More.. It gave me a beep and said, press to "dont show it again" and pressing that gave a result. If I said "ok", it gave me an serious errror ... I...

Mathematica 5.0 I am using version 5.0 of mathematica and looks like it doesn't going to work..you think that's the version problem !?? I should try with 5.2. Just curious, Have you tried it on 5.0 ..?? I shall get 5.2 and try running the code on 5.2 and let u knw the details. Thanks

Pde Hi there: I changed the sign of the second terma and NDsolve is not able to comprehend the problem. your code with a - sign for the second term worked fine. Just by changing the sign of the second term, things are falling apart..is it becos of chanign the PDE from Ellip to Hyper or the...

changing Coefficients Hi: as you spotted that, pi was the problem. I tried changing the sign of the second term \frac {\partial ^{2}u}{\partial x^{2}} from - to + I guess the system doesn't acknowlege that ! did u try that sign change? says not a Diff eqn..what do you suggest?

Mathematica problem Hi: I used Mathematica 5.0 to evaluate the sample code that you had written and came across whole bunch of errors.. NDSolve::ndnum: Encountered non-numerical value for a derivative at t == 0. ... General::stop: Further output of ReplaceAll::reps will be suppressed...

I have a problem that I tried to solve using MAPLE but I guess wasnt doing the right thing. \frac {\partial ^{2} \delta}{\partial t^{2}}+ S*(\frac {\partial^{2}\delta}{\partial \eta^{2}}+M*\frac {\partial^{4}\delta}{\partial \eta^{4}})-G* \frac {\partial ^{3} \delta}{\partial \eta ^{2}...