qpms/TODO.md

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TODO list before public release
===============================
- Tests!
- Docs!
- Cross section calculations.
- Field calculations.
- Complex frequencies, n's, k's.
- Transforming point (meta)generators.
- Check whether moble's quaternions and my
quaternions give the same results in tmatrices.py
- Ewald summations of all types of lattices (dimensionality-wise).
- Split lattices.h into separate point generator and lattice vector manipulation parts.
* Maybe move something from the .h to .c file.
- Check exact normalisation convention of scuff-tmatrix output.
- Check whether the Condon-Shortley phase affects the form of Wigner matrices.
- The xflip, yflip and possible i-factor problem.
- General 3D point group symmetries.
* Instead the current hard-coded limited set.
* The generation, finding subgroups etc. should be "easy" with
quaternions and stuff, as the set is quite limited,
see [Wikipedia](https://en.wikipedia.org/wiki/Point_groups_in_three_dimensions).
* Not sure about the representations, though.
* As a description of a T-matrix / particle metadata.
- Nice CLI for all general enough utilities.
- Remove legacy code.
- Split qpms_c.pyx.
- Reduce compiler warnings.
- Python exceptions instead of hard crashes in the C library where possible.
- Scatsystem init sometimes fail due to rounding errors and hardcoded absolute tolerance
in the qpms_tmatrix_isclose() call.
- Prefix all identifiers. Maybe think about a different prefix than qpms?
- Consistent indentation and style overall.
- Rewrite the parallelized translation matrix, mode problem matrix generators
in a way that reuses as much code as possible without copypasting
Nice but less important features
--------------------------------
- Static, thread-safe caches of constant coefficients + API without the current "calculators".