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 > involves a du/dt term, as described in this book preview, equation 1.1: > http://www.amazon.com/Numerical-Solutions-Time-Dependent-Advection-Diffusion-Reaction-Equations/dp/3540034404 > 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. ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. Plus, you'll get a chance to win $100 to spend on ThinkGeek. http://p.sf.net/sfu/slashdot-survey _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
