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From: Torsten Hennig on 11 Aug 2010 05:34
> :) i was just doing that, thank you so much.
> I wish i can run this code, otherwise no way i can
> solve this equation. i have been trying several
> books and articles about "how to solve nonlinear
> pdes" last few weeks, but none of them was helpful (
> either i did not understand or the form of equations
> were different).
>
> could you please let me know if you have some other
> ideas about error?
>
>

Did you try running the first example under
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/pdepe.html

Best wishes
Torsten.

> Thank you,
> Burcu
From: Burcu on 11 Aug 2010 10:21
Thank you again.

I just want to tell you that I tried all pdepe examples(pdex1pe, pdex2pe, pdex3pe, pdex4pe), all exapmles are working and giving results. and i also checked documentation if i did something wrong. however every thing seems fine, but still gives error.

if u have any furher suggestion, please let me know.

millions of thanks,
Burcu
From: Burcu on 11 Aug 2010 11:03
hi again,

this is just a kind of update.

i think the error is related with s(x,t,u,dudx) function, since my equation's form includes 2/3*u*(du/dx)^2. is there any know restrictions about s(x,t,u,dudx) ?

thank you,
burcu
From: Torsten Hennig on 11 Aug 2010 07:05
I'm not familiar with MATLAB syntax, but try this:

cozum.m file:
%% cozum of the formula
function [c,f,s] = cozum(x,t,u,DuDx)
c = [1];
f = [DuDx(1)/3];
s = [2/3*u(1)*DuDx(1)^2-2*u(1)/3*t];%+ (b/3*g*t)

cozumBC.m file:
%% boundary conditions
function [pleft,qleft,pright,qright] = cozumBC(xl,ul,xr,ur,t)
pleft = [1];
qleft = [0];
pright = [0];
qright = [1];

cozumIC.m file:
%% initial conditions
function u0 = cozumIC(x)
u0 = [1]; %ca/ca0;
end
From: Torsten Hennig on 11 Aug 2010 07:15
> hi again,
>
> this is just a kind of update.
>
> i think the error is related with s(x,t,u,dudx)
> function, since my equation's form includes
> 2/3*u*(du/dx)^2. is there any know restrictions
> ns about s(x,t,u,dudx) ?
>
> thank you,
> burcu

Did you try my version ?

Best wishes
Torsten.
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