[Numpy-discussion] PyDX - announcement

David M. Cooke cookedm at physics.mcmaster.ca
Tue Oct 24 13:54:08 CDT 2006

On Oct 22, 2006, at 17:38 , Simon Burton wrote:
> Apologies if this is too off-topic for these lists, but
> I hope some people here find this interesting!

It looks very nifty. Interval arithmetic for rigourous bounds is  
something that should be used more often, I think.

You should add it to the topical software list at http:// 

[and it's on topic, btw; announcements of Python numerical software  
is always welcome here].

> PyDX - first public announcement
> ================================
> Overview
> --------
>     PyDX is a package for working with calculus (differential  
> geometry),
> arbitrary precision arithmetic (using gmpy), and interval arithmetic.
> It provides:
>     * multivariate automatic differentiation (to arbitrary order)
>     * Tensor objects for computations in differential geometry
>     * Interval scalars (based on libMPFI) for calculating rigorous  
> bounds
> on arithmetic operations (validated numerics).
>     * Arbitrary order validated ODE solver.
> PyDX uses lazy computation techniques to greatly enhance  
> performance of
> the resulting functions.
> This code grew out of a research project at The Australian National  
> University,
> Department of Physics, which involved computing bounds on geodesics in
> relativistic space-time's.

|David M. Cooke              http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca

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