libwigner v0.5.0

# libwignernj 0.5.0 — Mendeley Data deposit

This dataset is the source-code archive accompanying the Computer
Physics Communications submission

> S. Lehtola, *libwignernj: a self-contained C99 library for the
> exact evaluation of Wigner 3j, 6j, 9j symbols, Clebsch–Gordan,
> Racah W, Fano X, and Gaunt coefficients*, Comput. Phys. Commun.
> (submitted 2026).

## Contents

A single archive `libwignernj-0.5.0.tar.gz` (SHA-256 listed below)
containing the complete source tree of `libwignernj` at tag
`v0.5.0`, including:

- C99 source (`src/`, `include/`)
- C++11 header-only wrapper (`include/wignernj.hpp`)
- Fortran 90 module (`src/fortran/wignernj_f90.F90`)
- CPython extension and Python-package source (`src/python/`,
`wignernj/`)
- Test suite (`tests/`) — both the C-side ctest binaries and the
Python pytest suite, plus the deterministic reference-table
generator `tests/gen_refs.py`
- Examples (`examples/`)
- Library-versioning microbenchmarks (`benchmarks/`)
- Build system: CMake (top-level `CMakeLists.txt`) and PEP-517
Python (`pyproject.toml`)
- CI configuration (`.github/workflows/`, `.circleci/config.yml`)
- Documentation: `README.md`, `CHANGELOG.md`, `docs/reference.md`,
`docs/optimization_notes.md`
- Licence: `LICENSE` (BSD 3-Clause)

The archive is the canonical GitHub-published tarball for tag
`v0.5.0`, fetched from
<https://github.com/susilehtola/libwignernj/archive/refs/tags/v0.5.0.tar.gz>.

## Quick start

```
tar xzf libwignernj-0.5.0.tar.gz
cd libwignernj-0.5.0
cmake -B build -DBUILD_TESTS=ON
cmake --build build -j
ctest --test-dir build
```

The Python package is installable from PyPI (`pip install
wignernj`) but can also be built from this archive with `pip
install .` from the extracted directory.

## License

BSD 3-Clause. See `LICENSE` in the archive.

## Versioning

This deposit corresponds to the immutable git tag `v0.5.0`; later
releases will be deposited as separate Mendeley Data datasets and
will be referenced from the same code repository on GitHub.