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PyDDE is not fully compatible with the approach to C-based back ends that is taken in PyDSTool, although maybe the future setup installer for PyDSTool will be able to compile the C code in a platform independent way. There are DDE solvers by Hairer and Wanner which we would rather interface to, since they are related to the solvers for ODEs we already have wrapped and we could re-use a lot of...
2009-09-11 03:30:22 UTC by robclewley
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Ah, thank you for the answer! As you can see, my knowledge of ODEs is somewhat basic; I was not familiar with the DDE term.
For the record, I know both C and Python well, swig less well (I prefer Cython) but I could learn.
I guess that integration of DDEs in PyDSTool would best be done at the scipy level; and there is a ticket to that effect.
http://projects.scipy.org/scipy/ticket/291
They...
2009-09-09 03:29:53 UTC by maparent
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The only thing you can delay at the moment are delta function impulses (see the tests/ directory where there are some filenames with "delay" in the title, showing of a somewhat complex implementation of delayed impulse that we currently have). There are DDE integrators available but no-one has finished wrapping them so that we can use them in PyDSTool. If you have some background in...
2009-09-09 02:09:42 UTC by robclewley
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Good day!
I am interested in dynamic systems simulation, and have some limited experience with both ODE and system dynamic tools such as Stella, Simgua, Vensim, etc. ODE integrators in general, and PyDSTool in particular, offer a good part of the functionality of those packages; one notable exception is delay functions, i.e. using the value of a variable at a previous "time" (indep...
2009-09-08 18:14:29 UTC by maparent
