Hello, I would be interested in quaternions, spherical rotations, and interpolations thereof, a la slerp..... I quickly look at the online doc of scipy/numpy, and did not find any mention of these. Can someone point me to such functionalities in either package? thanks, Johann
On Tue, Jun 2, 2009 at 00:35, Cohen-Tanugi Johann <cohen <at> lpta.in2p3.fr> wrote: > > Hello, > I would be interested in quaternions, spherical rotations, and > interpolations thereof, a la slerp..... I quickly look at the online doc > of scipy/numpy, and did not find any mention of these. Can someone point > me to such functionalities in either package? We don't have them. -- -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
is there an interest in them? JCT Robert Kern wrote: > On Tue, Jun 2, 2009 at 00:35, Cohen-Tanugi Johann <cohen <at> lpta.in2p3.fr> wrote: > >> Hello, >> I would be interested in quaternions, spherical rotations, and >> interpolations thereof, a la slerp..... I quickly look at the online doc >> of scipy/numpy, and did not find any mention of these. Can someone point >> me to such functionalities in either package? >> > > We don't have them. > >
On Tue, Jun 2, 2009 at 01:13, Cohen-Tanugi Johann <cohen <at> lpta.in2p3.fr> wrote: > is there an interest in them? Sure! -- -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
well, I found https://scicompforge.org/tracker/scicompforge/file/trunk/crystallography/usage/test/output/python/Quaternion.py?rev=2139 and http://cgkit.sourceforge.net/doc2/quat.html I hope that helps others in the list..... it would be nice to have this in scipy though.... best, JCT Robert Kern wrote: > On Tue, Jun 2, 2009 at 01:13, Cohen-Tanugi Johann <cohen <at> lpta.in2p3.fr> wrote: > >> is there an interest in them? >> > > Sure! > >
Hi,
I have a related question. I have programmed a couple of
quaternion-valued functions and used arrays with a customized numpy
dtype for it. Something like
dtype = [('r',np.double),('i',np.double),('j',np.double),('k',np.double)]
Now, I am wondering if there is an easy way (e.g. using cython) to
define a custom quaternion scalar type and make numpy aware of it. I
found some information in the numpy book about this topic but couldn't
find any example code.
If anyone has working example code, that would be great -- as I said,
ideally using cython, but c code would be fine too.
Thanks,
Kilian
On Tue, Jun 2, 2009 at 6:09 AM, Johann Cohen-Tanugi
<Johann.COHEN-TANUGI <at> lpta.in2p3.fr> wrote:
> well, I found
> https://scicompforge.org/tracker/scicompforge/file/trunk/crystallography/usage/test/output/python/Quaternion.py?rev=2139
>
> and
> http://cgkit.sourceforge.net/doc2/quat.html
>
> I hope that helps others in the list..... it would be nice to have this
> in scipy though....
> best,
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On Wed, Jun 3, 2009 at 16:39, killian koepsell <koepsell <at> gmail.com> wrote:
> Hi,
>
> I have a related question. I have programmed a couple of
> quaternion-valued functions and used arrays with a customized numpy
> dtype for it. Something like
>
> dtype = [('r',np.double),('i',np.double),('j',np.double),('k',np.double)]
>
> Now, I am wondering if there is an easy way (e.g. using cython) to
> define a custom quaternion scalar type and make numpy aware of it. I
> found some information in the numpy book about this topic but couldn't
> find any example code.
>
> If anyone has working example code, that would be great -- as I said,
> ideally using cython, but c code would be fine too.
Look at the docs/newdtype_example/ directory.
--
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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