2011/7/29 Benjamin Root ben.r...@ou.edu:
I am starting to get very interested in this quaternion concept (and maybe
how I could use it for mplot3d), but I have never come across it before
(beyond the typical vector math that I am familiar with). Can anybody
recommend a good introductory
Hi Hans,
Sorry, that is actually what I implemented, I just documented it
iincorrectly. I have just pushed an update to the README. Thanks for
pointing this out!
Martin
On Sun, Jul 31, 2011 at 07:57:58AM +0200, Hans Meine wrote:
Hi Martin,
I think it would be more useful if isfinite
Hi Ben
On Fri, Jul 29, 2011 at 12:57 PM, Benjamin Root ben.r...@ou.edu wrote:
I am starting to get very interested in this quaternion concept (and maybe
how I could use it for mplot3d), but I have never come across it before
(beyond the typical vector math that I am familiar with). Can
Hi Martin,
I think it would be more useful if isfinite returned true if *all* elements
were finite. (Opposite of isnan and isinf.)
HTH,
Hans
PS: did not check the complex dtype, hopefully that one's no different.
(The above has been typed using a small on-screen keyboard, which may
On Thu, Jul 28, 2011 at 09:48:29PM -0500, Robert Love wrote:
Quaternions have a handedness or a sign convention. The recently
departed Space Shuttle used a Left versor convention while most
things, including Space Station, use the right versor convention, in
their flight software. Made for
On Fri, Jul 29, 2011 at 9:03 AM, Martin Ling martin-nu...@earth.li wrote:
On Thu, Jul 28, 2011 at 09:48:29PM -0500, Robert Love wrote:
Quaternions have a handedness or a sign convention. The recently
departed Space Shuttle used a Left versor convention while most
things, including Space
On Fri, Jul 29, 2011 at 09:14:00AM -0600, Charles R Harris wrote:
Well, if the shuttle used a different definition then it was out there
somewhere. The history of quaternions is rather involved and mixed up with
vectors, so it may be the case that there were different conventions.
On Fri, Jul 29, 2011 at 11:07 AM, Martin Ling martin-nu...@earth.li wrote:
On Fri, Jul 29, 2011 at 09:14:00AM -0600, Charles R Harris wrote:
Well, if the shuttle used a different definition then it was out there
somewhere. The history of quaternions is rather involved and mixed up
On Fri, Jul 29, 2011 at 2:52 PM, Charles R Harris charlesr.har...@gmail.com
wrote:
On Fri, Jul 29, 2011 at 11:07 AM, Martin Ling martin-nu...@earth.liwrote:
On Fri, Jul 29, 2011 at 09:14:00AM -0600, Charles R Harris wrote:
Well, if the shuttle used a different definition then it was
On Fri, Jul 29, 2011 at 1:57 PM, Benjamin Root ben.r...@ou.edu wrote:
On Fri, Jul 29, 2011 at 2:52 PM, Charles R Harris
charlesr.har...@gmail.com wrote:
On Fri, Jul 29, 2011 at 11:07 AM, Martin Ling martin-nu...@earth.liwrote:
On Fri, Jul 29, 2011 at 09:14:00AM -0600, Charles R Harris
On Fri, Jul 29, 2011 at 2:57 PM, Benjamin Root ben.r...@ou.edu wrote:
On Fri, Jul 29, 2011 at 2:52 PM, Charles R Harris
charlesr.har...@gmail.com wrote:
On Fri, Jul 29, 2011 at 11:07 AM, Martin Ling martin-nu...@earth.liwrote:
On Fri, Jul 29, 2011 at 09:14:00AM -0600, Charles R Harris
On Wed, Jul 27, 2011 at 10:29:08PM -0500, Robert Love wrote:
To use quaternions I find I often need conversion to/from matrices and
to/from Euler angles. Will you add that functionality?
Yes, I intend to. Note that these conversions are already available in
the standalone (non-dtype)
On Jul 28, 2011, at 7:42 AM, Martin Ling wrote:
On Wed, Jul 27, 2011 at 10:29:08PM -0500, Robert Love wrote:
To use quaternions I find I often need conversion to/from matrices and
to/from Euler angles. Will you add that functionality?
Yes, I intend to. Note that these conversions are
On Thu, Jul 28, 2011 at 21:48, Robert Love rblove_li...@comcast.net wrote:
On Jul 28, 2011, at 7:42 AM, Martin Ling wrote:
On Wed, Jul 27, 2011 at 10:29:08PM -0500, Robert Love wrote:
To use quaternions I find I often need conversion to/from matrices and
to/from Euler angles. Will you add
On Thu, Jul 28, 2011 at 8:48 PM, Robert Love rblove_li...@comcast.netwrote:
On Jul 28, 2011, at 7:42 AM, Martin Ling wrote:
On Wed, Jul 27, 2011 at 10:29:08PM -0500, Robert Love wrote:
To use quaternions I find I often need conversion to/from matrices and
to/from Euler angles. Will
On Thu, Jul 28, 2011 at 8:48 PM, Robert Love rblove_li...@comcast.netwrote:
On Jul 28, 2011, at 7:42 AM, Martin Ling wrote:
On Wed, Jul 27, 2011 at 10:29:08PM -0500, Robert Love wrote:
To use quaternions I find I often need conversion to/from matrices and
to/from Euler angles. Will
To use quaternions I find I often need conversion to/from matrices and to/from
Euler angles. Will you add that functionality? Will you handle the left
versor and right versor versions?
I have a set of pure python code I've sketched out for my needs (aerospace) but
would be happy to have an
On Sat, Jul 16, 2011 at 4:50 PM, Martin Ling martin-nu...@earth.li wrote:
Hi all,
I have just pushed a package to GitHub which adds a quaternion dtype to
NumPy: https://github.com/martinling/numpy_quaternion
Some backstory: on Wednesday I gave a talk at SciPy 2011 about an
inertial sensing
On Sat, Jul 16, 2011 at 08:16:44PM -0400, Anne Archibald wrote:
The next interesting question is, how well does scipy.interpolate deal
with them? For really good rotational paths I seem to recall you want
specialized splines, but simply interpolating in the quaternion domain
is not a bad quick
On Sun, Jul 17, 2011 at 05:52:19PM +0200, Ralf Gommers wrote:
Looks very interesting.
One thing that is surprising to me is that the quaternion dtype is
inserted in to the numpy namespace. For dtypes that are planned to be
integrated with numpy later on perhaps this makes
Wow, that makes for a great howto example. Thanks.
On Jul 16, 2011, at 7:50 AM, Martin Ling wrote:
Hi all,
I have just pushed a package to GitHub which adds a quaternion dtype to
NumPy: https://github.com/martinling/numpy_quaternion
Some backstory: on Wednesday I gave a talk at SciPy
What a useful package! Apart from helping all the people who know they
need quaternions, this package removes one major family of use cases
for vectorized small-matrix operations, namely, 3D rotations.
Quaternions are the canonical way to represent orientation and
rotation in three dimensions, and
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