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View Code? Open in Web Editor NEWODE system solver using dG(q), time-discontinuous Galerkin with Lobatto basis.
License: BSD 2-Clause "Simplified" License
ODE system solver using dG(q), time-discontinuous Galerkin with Lobatto basis.
License: BSD 2-Clause "Simplified" License
When pydgq
is installed under Python 3.6, both data files pydgq_data_27.bin
(old, for Python 2.7) and pydgq_data_34.bin
(compatible with 3.4 and later, tested also in 3.6) get installed under their own names, but the symlink (that should point to the correct version) fails to install.
Solution: drop Python 2.7 support in the next release, so we need only one universal data file for Python 3.x.
Workaround: meanwhile, go to your site-packages/pydgq
in a terminal, and install the symlink manually. Assuming pydgq
was installed with pip3 install pydgq --user
under Python 3.6, the full path is ~/.local/lib/python3.6/site-packages/pydgq
. Once there, ln -s pydgq_data_34.bin pydgq_data.bin
. Or if using Windows, just copy the file.
Currently, pydgq
only supports Picard (fixed-point) iteration in all implicit solvers (including the Galerkin solvers). This is the simplest thing that works, but the convergence rate is linear (constant number of added correct bits per iteration).
Newton-Raphson would be a useful option to have for improving performance, because it converges quadratically (number of correct bits doubled per iteration).
The contact email in setup.py
is outdated. PyPI uses it to provide the link to email the maintainer. Update it for the next release.
Python 2.7 will be out of support January 1, 2020.
Dropping support for it allows a simple solution for #1.
A possibly incomplete list of things to remember:
setup.py
.runtests2.sh
.runtests3.sh
into a runtests.py
. Shell? Where we're going, we need no shell.
unittest
from the stdlib.pytest
would be even nicer, but introduces a dependency.Currently, pydgq
considers an iteration complete once all bits of the double-precision 64-bit float agree.
While this is useful for very sensitive equations (e.g. those in undamped vibration problems), for other real-world use a convergence tolerance setting would be useful.
1e-6
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