Modified BSD license.
NumPy is an open source library for the Python programming language.
Features: support for large, multi-dimensional arrays and matrices, along with a large collection of high-level mathematical functions to operate on these arrays.
Mathematical algorithms implemented in interpreted languages (e.g., Python) are often much slower than the same algorithms implemented in compiled languages (e.g., Fortran, C, Java).
The NumPy library provides implementations of computational algorithms (in the form of functions and statements) optimized for working with multidimensional arrays.
As a result, any algorithm expressed as a sequence of operations on arrays (matrices), implemented using NumPy, runs as fast as equivalent code executed in MATLAB.