DDE-BIFTOOL v. 2.03

The version number of the package can be obtained by calling the function biftool from within Matlab.

Versions 1.01, 1.02, 2.00, 2.02 and 2.03 feature the following improvements:

Removal of the bugs and problems found in previous versions. See here for a description.
A very useful Mathematica program genr_sys.mth written by D. Pieroux now allows automatic generation of the system definition files (including the derivatives obtained analytically within Mathematica)!
A more efficient Floquet multiplier calculation routine.
A second and more extended demonstration example. However, the calculations in this demo have been found to be quite sensitive and hence, results can differ for different versions of Matlab. I am currently working on a new version which avoids these problems. In particular, this demo does not always run to completion.

Version 1.02, 2.00, 2.02 and 2.03 feature the following improvements:

Compatibility with Matlab 6.
A br_refin routine that allows to refine branches by clicking on the mouse button! Type help br_refin in Matlab to find out how to use this function.

Versions 2.00, 2.02 and 2.03 feature the following improvements:

The possibility to analyse systems with a finite number of discrete, state-dependent delays.
The computation of connecting orbits (both homoclinic and heteroclinic solutions).

Versions 2.02 and 2.03 features the following improvements:

The possibility to generate starting points for branch switching of branching bifurcations (transcritical, pitchfork) for steady state solutions and periodic solutions (type help p_tostst or help p_to_psol to get help on those functions).
The possibility to generate starting values for heteroclinic solutions as well (next to homoclinic solutions). Type help p_tohcli to find a description.

Version 2.03 features the following improvement: The computation of the right-most characteristic roots of steady state points using a new steplength heuristic (including the use of the linear multistep methods of maximal order). Note that Versions 1.01, 1.02, 2.00, 2.02 and 2.03 are completely compatible with Version 1.00. (Note also that the manual was updated for version 2.00. It can be found here. Additionally, an addendum was written to describe the new functionality in DDE-BIFTOOL v. 2.03 compared to the previous version, DDE-BIFTOOL v. 2.02.)

Extensions:

Didier Pieroux wrote a very useful Mathematica program which allows automatic generation of the system definition files (including the derivatives obtained analytically within Mathematica). This program is included as genr_sys.mth.

All comments, suggestions and questions can be mailed.

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This page, http://www.cs.kuleuven.ac.be/cwis/research/twr/research/software/delay/newddebif.shtml, is maintained by ddebiftool.
Last modified March 15, 2007.