[Numpy-discussion] [enhancement] sum_angle() and sum_polar()

[Robert Jördens]

On Tue, May 29, 2012 at 11:03 AM, Stéfan van der Walt <stefan at sun.ac.za> wrote:
> On Mon, May 28, 2012 at 11:53 AM, Travis Oliphant <travis at continuum.io> wrote:
>> I could see these functions going into scipy.ndimage but again because they
>> are not necessarily just image processing functions, and the fact that they
>> are so simple, perhaps they are best put into NumPy itself.
>
> I'm wondering about the general applicability of these functions.  Can
> anyone suggest some use cases?

An example from solid state physics:
If you have a spin chain with some long-range interaction and you have
the known, dense, coupling matrix J, sum_angle(J, pi/4) gives you a
view at the distance dependence of the interaction.

-- 
Robert Jordens.