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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
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64 bit python lib issue that is fixed in SVN.
2009-03-18 16:57:45 UTC by robclewley
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gdb python
GNU gdb (GDB; openSUSE 11.1) 6.8.50.20081120-cvs
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for...
2009-03-18 11:25:58 UTC by nils106
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robclewley changed the public information on the PyDSTool project.
2009-03-11 04:57:23 UTC by robclewley
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Fixed in SVN, will be updated in next release. Thanks!
2007-09-05 16:45:39 UTC by robclewley
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If using set('globalt0'=t0) for a MapSystem Generator object.
The MapSystem class is based on the discGen Class and in the MapSystem.py module the discGen class of baseclasses is imported.
But in the set method of the MapSystem class the undefined ctsGen.set() methode is used to set "globalt0" and "checklevel" values.
This raises an error of undefined global name 'ctsGen'.
I suppose that...
2007-09-05 10:00:19 UTC by gschutz
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There are lots of minor improvements and fixes in this version, but a major feature is the support for user-defined functions for continuation using PyCont.
Also added: some basic phase-plane tools, calculation of phase response curves for oscillators and support for some special math functions. See release notes for details.
2007-07-12 02:48:10 UTC by robclewley
