numbits

Pack and unpack 1, 2 and 4 bit data to/from 8-bit numpy arrays

Motivated by radio astronomy, where low bitwidths are common.

Project built with pybind11. Pack/unpack code based on sigpyproc.

Installation

On Unix (Linux, OS X)

You can either:

• Install numbits from PyPI with:

  pip install numbits
  

or you can:

• Clone this repository. and then:

  • Build shared object .so locally, using:

    python setup.py build_ext -i
    

  • Or install the package globally, using:

    python -m pip install .
    

    or:

    python setup.py install
    

Test call

import numpy as np
import numbits
a = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8], dtype='uint8')
b = numbits.unpack(a, nbits=2)

>>> array([0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 1, 0, 0, 0,
           1, 1, 0, 0, 1, 2, 0, 0, 1, 3, 0, 0, 2, 0], dtype=uint8)