[Numpy-discussion] ANN: Numexpr 1.3 released

Francesc Alted faltet at pytables.org
Tue Jun 2 13:32:35 EDT 2009

 Announcing Numexpr 1.3

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.

On this release, and due to popular demand, support for single
precision floating point types has been added.  This allows for both
improved performance and optimal usage of memory for the
single precision computations.  Of course, support for single
precision in combination with Intel's VML is there too :)

However, caveat emptor: the casting rules for floating point types
slightly differs from those of NumPy.  See the ``Casting rules``
section at:


or the README.txt file for more info on this issue.

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


or have a look at RELEASE_NOTES.txt in the tarball.

Where I can find Numexpr?

The project is hosted at Google code in:


And you can get the packages from PyPI as well:


How it works?



for a detailed description by the original author (David M. Cooke).

Share your experience

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


Francesc Alted

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