On Wed, Jul 27, 2011 at 3:15 PM, c.
<address@hidden> wrote:
Hi,
First of all, BIM is a package from Octave-Forge, it is
not part of the core Octave project, so the correct place where
to discuss this matter is the Octave-Forge mailing list, so I am moving this thread there.
On 27 Jul 2011, at 19:42, J Stasko wrote:
> I have been looking at the tutorial with BIM,
> bim-1.0.1/doc/tutorial.html
>
> It seems that the ADR equation (or DAR equation- are they the same thing?)
yes
The title of the book you cite says it all,
"Numerical Solutions of TIME DEPENDENT Advection Diffusion Reaction Equations"
while the tutorial deals with a steady state DAR equation
> I do not see this tutorial progressing through time. Am I correct?
Yes, the extension, though, is quite trivial.
For example, given the equation
du/dt - d/dx (D du/dx - C u) + R u = f 0 < t < N*T
after time semi-discretization with implicit Euler method and a fixed time-step T becomes
- d/dx (D d u_i /dx - C u_i) + (R + 1/T) u_i = f + u_{i-1} / T, i = 1 ... N
which is a sequence of steady state DAR problems, so once you are able to solve steady-state
you are able to solve time-dependent as well.
If you'd like an example using more advanced time stepping techniques I have quite a few using DASPK
for fully-implicit adaptive time-stepping, but I never added them to the repository because I do not
have time to write documentation for them.
> Thank you,
>
> John S.
c.