Functional Arrays

The funcarray package contains a class to construct arrays that generate values on demand, with optimised functions to iterate over it and perform specific operations.

• Free software: GNU General Public License v3

Installation

Install using:

pip install funcarray

Usage

Functional arrays are instantiated by passing it a shape and a function that must return each element of the matrix given the index of the element and a set of arguments. The given function must therefore obey the format fun(*index, *args).

from funcarray import array
from numba import jit
import numpy as np
from numpy.random import default_rng

@jit(nopython=True)
def fun(i, j, x, y):
    return x[i]*y[j]

N = 10000
rnd = default_rng()
x = rnd.random(N, dtype='f8')
y = rnd.random(N, dtype='f8')
a = array((N, N), fun, x, y)

# Compute sum over all elements
print(a.sum())

Development

Please work on a feature branch and create a pull request to the development branch. If necessary to merge manually do so without fast forward:

git merge --no-ff myfeature

To build a development environment run:

python3 -m venv env 
source env/bin/activate 
pip install -e '.[dev]'

For testing:

pytest --cov

Credits

This is a project by Leonardo Niccolò Ialongo .