[Numpy-discussion] ANN: numexpr 2.4.5 released

Francesc Alted faltet at gmail.com
Mon Nov 2 05:09:05 EST 2015

 Announcing Numexpr 2.4.5

Numexpr is a fast numerical expression evaluator for NumPy.  With it,
expressions that operate on arrays (like "3*a+4*b") are accelerated
and use less memory than doing the same calculation in Python.

It wears multi-threaded capabilities, as well as support for Intel's
MKL (Math Kernel Library), which allows an extremely fast evaluation
of transcendental functions (sin, cos, tan, exp, log...)  while
squeezing the last drop of performance out of your multi-core
processors.  Look here for a some benchmarks of numexpr using MKL:


Its only dependency is NumPy (MKL is optional), so it works well as an
easy-to-deploy, easy-to-use, computational engine for projects that
don't want to adopt other solutions requiring more heavy dependencies.

What's new

This is a maintenance release where an important bug in multithreading
code has been fixed (#185 Benedikt Reinartz, Francesc Alted).  Also,
many harmless warnings (overflow/underflow, divide by zero and others)
in the test suite have been silenced  (#183, Francesc Alted).

In case you want to know more in detail what has changed in this
version, see:


Where I can find Numexpr?

The project is hosted at GitHub in:


You can get the packages from PyPI as well (but not for RC releases):


Share your experience

Let us know of any bugs, suggestions, gripes, kudos, etc. you may

Enjoy data!

Francesc Alted
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