[SciPy-Dev] Spherical Harmonics and Condon-Shortley phase

[Freddy Rietdijk]

Thanks for pointing out it is included in the docs. I guess I was looking
at an older version...
The directivity pattern / spherical harmonics look like they should be so I
suppose it is fine.

On Mon, Mar 2, 2015 at 7:21 PM, Evgeni Burovski <evgeny.burovskiy at gmail.com>
wrote:

> On Mon, Mar 2, 2015 at 5:51 PM, Eric Moore <ewm at redtetrahedron.org> wrote:
> > An explicit formula for what is calculate is given in the docs:
> >
> http://docs.scipy.org/doc/scipy-dev/reference/generated/scipy.special.sph_harm.html#scipy.special.sph_harm
> .
> > But the short answer is that it does not include the Condon-Shortly
> phase.
> > Probably still worth comparing what it provides to what you expect if you
> > haven't already.
>
>
> Might be worth to add a line or two about Condon-Shortly phase into
> the dosctring as well. Eg, as an example or just with a reference to a
> book or software package which does include it.
>
> Evgeni
>
>
>
>
> > This particular function was made into a ufunc last summer (instead of
> being
> > implemented as a python function).   I'd try to use a current Scipy if
> you
> > will need to call this a lot, its likely to me substantially faster.
> >
> > Eric
> >
> > On Thu, Feb 26, 2015 at 9:33 AM, Freddy Rietdijk <
> freddyrietdijk at fridh.nl>
> > wrote:
> >>
> >> Hi,
> >>
> >> I'm working with auralization and Ambisonics, and the directivity
> patterns
> >> that are used with Ambisonics are spherical harmonics. Scipy has an
> >> implementation, scipy.special.sph_harm. Several definitions exist
> however
> >> for spherical harmonics, and the documentation does not specify which is
> >> implemented.
> >>
> >> A common definition that is used in quantum-mechanics includes the
> >> Condon-Shortley phase, which is a (-1)**m factor.
> >>
> >>
> http://en.wikipedia.org/wiki/Spherical_harmonics#Condon.E2.80.93Shortley_phase
> >>
> >> For my purpose, Ambisonics, I need spherical harmonics without this
> >> factor.
> >> I found the code, which uses external functions, quite difficult to
> read.
> >> I did see `(-1)**mp` but I'm not sure now whether this really is the CS
> >> phase or not.
> >>
> >> Who knows which definition is used in `sph_harm`?
> >>
> >> Frederik
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >>
> >
> >
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