Biff has been merged into gala!

The relevant parts of Biff have been moved into gala!

Below preserved for posterity.

Basis function expansions of gravitational potentials.

Documentation

Installation dependencies

The internals of Biff are implemented in C and Cython. To build the Cython code, you'll need to have installed GNU scientific library (GSL). On a Mac, I recommend installing this with Homebrew or anaconda. With anaconda, you can install GSL with:

conda -c https://anaconda.org/asmeurer/gsl install gsl

You'll also need the following packages:

- [Cython](https://github.com/cython/cython)
- [Numpy](https://github.com/numpy/numpy)
- [Scipy](https://github.com/scipy/scipy)
- [Astropy](https://github.com/astropy/astropy)
- [Gala](https://github.com/adrn/gala) (install with `pip install astro-gala`)