Re: [Numpy-discussion] Quaternion data type
I am quite interested in a fixed point data type. I had produced a working model some time ago. Maybe I can use some of these new efforts to provide good examples as a guide. ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 9:43 PM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 1:06 PM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Another repository under the numpy umbrella would best fit what I'm imagining, yes. I would imagine it as a package of additional types that aren't the core ones, but that many people would probably want to install. It would also be a way to continually exercise the type extension system, to make sure it doesn't break. It couldn't be a branch of numpy, rather a collection of additional dtypes and associated useful functions. I would be in favor of this as well. We could start the repository by having one trivial dtype that would serve as an example. That's something I have been interested in, I can lock a couple of hours / week to help this with. David ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sun, May 6, 2012 at 3:56 AM, David Cournapeau courn...@gmail.com wrote: On Sat, May 5, 2012 at 9:43 PM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 1:06 PM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Another repository under the numpy umbrella would best fit what I'm imagining, yes. I would imagine it as a package of additional types that aren't the core ones, but that many people would probably want to install. It would also be a way to continually exercise the type extension system, to make sure it doesn't break. It couldn't be a branch of numpy, rather a collection of additional dtypes and associated useful functions. I would be in favor of this as well. We could start the repository by having one trivial dtype that would serve as an example. That's something I have been interested in, I can lock a couple of hours / week to help this with. How about if I start by working on adding tests within numpy_quaternion, then this can be migrated into an extended dtypes package when it is set up. A nice trivial dtype example would be very useful, as I mentioned just last week our group was wondering how to make a new dtype. - Tom ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sun, May 6, 2012 at 6:02 AM, Tom Aldcroft aldcr...@head.cfa.harvard.eduwrote: On Sun, May 6, 2012 at 3:56 AM, David Cournapeau courn...@gmail.com wrote: On Sat, May 5, 2012 at 9:43 PM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 1:06 PM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Another repository under the numpy umbrella would best fit what I'm imagining, yes. I would imagine it as a package of additional types that aren't the core ones, but that many people would probably want to install. It would also be a way to continually exercise the type extension system, to make sure it doesn't break. It couldn't be a branch of numpy, rather a collection of additional dtypes and associated useful functions. I would be in favor of this as well. We could start the repository by having one trivial dtype that would serve as an example. That's something I have been interested in, I can lock a couple of hours / week to help this with. How about if I start by working on adding tests within numpy_quaternion, then this can be migrated into an extended dtypes package when it is set up. Sounds like a good start. You might want to ping Martin too. A nice trivial dtype example would be very useful, as I mentioned just last week our group was wondering how to make a new dtype. There is the rational dtype https://github.com/girving/rational. I expect there will be some interaction between numpy and the extension types as the bugs are worked out. Extension types for numpy haven't been much used. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On May 6, 2012, at 12:16 PM, Charles R Harris wrote: On Sun, May 6, 2012 at 6:02 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Sun, May 6, 2012 at 3:56 AM, David Cournapeau courn...@gmail.com wrote: On Sat, May 5, 2012 at 9:43 PM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 1:06 PM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Another repository under the numpy umbrella would best fit what I'm imagining, yes. I would imagine it as a package of additional types that aren't the core ones, but that many people would probably want to install. It would also be a way to continually exercise the type extension system, to make sure it doesn't break. It couldn't be a branch of numpy, rather a collection of additional dtypes and associated useful functions. I would be in favor of this as well. We could start the repository by having one trivial dtype that would serve as an example. That's something I have been interested in, I can lock a couple of hours / week to help this with. How about if I start by working on adding tests within numpy_quaternion, then this can be migrated into an extended dtypes package when it is set up. Sounds like a good start. You might want to ping Martin too. A nice trivial dtype example would be very useful, as I mentioned just last week our group was wondering how to make a new dtype. There is the rational dtype. I expect there will be some interaction between numpy and the extension types as the bugs are worked out. Extension types for numpy haven't been much used. Actually, they have been used fairly extensively in multiple projects that I am aware of. They have just not been discussed enough, nor is there a good open-source collection of extension dtypes. It is also harder than it really should be to create extension dtypes. -Travis ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Best, Tom - Ilan On Fri, May 4, 2012 at 5:36 PM, Charles R Harris charlesr.har...@gmail.com wrote: Hi Ilan On Fri, May 4, 2012 at 3:38 PM, Ilan Schnell ischn...@enthought.com wrote: Hello everyone, what is the plan for Quaternion data types in numpy? I saw that during last years SciPy spring https://github.com/martinling/numpy_quaternion was started, but not updated or released since then. That was Martin Ling, link and thread here . I'm not sure what happened with this but I suspect we are waiting for extension types to be fixed up in master. Mark had some thoughts along those lines. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.eduwrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? -Mark Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
Hi Tod, Would you consider bundling the quaternion dtype with your package. I think everybody wins: your package would become stronger and Martin's dtype would become easily available. Thanks Val On Sat, May 5, 2012 at 6:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.eduwrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Best, Tom - Ilan On Fri, May 4, 2012 at 5:36 PM, Charles R Harris charlesr.har...@gmail.com wrote: Hi Ilan On Fri, May 4, 2012 at 3:38 PM, Ilan Schnell ischn...@enthought.com wrote: Hello everyone, what is the plan for Quaternion data types in numpy? I saw that during last years SciPy spring https://github.com/martinling/numpy_quaternion was started, but not updated or released since then. That was Martin Ling, link and thread here . I'm not sure what happened with this but I suspect we are waiting for extension types to be fixed up in master. Mark had some thoughts along those lines. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? A extended dtype package would be a very good idea, and a great place for quaternions. But, I agree with Chuck that datetime64 is too fundamental to be pushed to a separate package. -Travis ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 1:06 PM, Charles R Harris charlesr.har...@gmail.comwrote: On Sat, May 5, 2012 at 11:19 AM, Mark Wiebe mwwi...@gmail.com wrote: On Sat, May 5, 2012 at 11:55 AM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. I kind of like the idea of there being a package, separate from numpy, which collects these dtypes together. To start, the quaternion and the rational type could go in it, and eventually I think it would be nice to move datetime64 there as well. Maybe it could be called numpy-dtypes, or would a more creative name be better? I'm trying to think about how that would be organized. We could create a new repository, numpy-user-types (numpy-extension-types), under the numpy umbrella. It would need documents and such as well as someone interested in maintaining it and making releases. A branch in the numpy repository wouldn't work since we would want to rebase it regularly. It could maybe go in scipy but a new package would need to be created there and it feels too distant from numpy for such basic types as datetime. Do you have thoughts about the details? Another repository under the numpy umbrella would best fit what I'm imagining, yes. I would imagine it as a package of additional types that aren't the core ones, but that many people would probably want to install. It would also be a way to continually exercise the type extension system, to make sure it doesn't break. It couldn't be a branch of numpy, rather a collection of additional dtypes and associated useful functions. -Mark Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
On Sat, May 5, 2012 at 12:55 PM, Charles R Harris charlesr.har...@gmail.com wrote: On Sat, May 5, 2012 at 5:27 AM, Tom Aldcroft aldcr...@head.cfa.harvard.edu wrote: On Fri, May 4, 2012 at 11:44 PM, Ilan Schnell ischn...@enthought.com wrote: Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. Hi - I'm a co-author of the above mentioned Quaternion package. I agree the numpy_quaternion version would be better, but if there is no expectation that it will move forward I can offer to improve our Quaternion. A few months ago I played around with making it accept arbitrary array inputs (with similar shape of course) to essentially vectorize the transformations. We never got around to putting this in a release because of a perceived lack of interest / priorities... If this would be useful then let me know. Would you be interested in carrying Martin's package forward? I'm not opposed to having quaternions in numpy/scipy but there needs to be someone to push it and deal with problems if they come up. Martin's package disappeared in large part because Martin disappeared. I'd also like to hear from Mark about other aspects, as there was also a simple rational user type proposed that we were looking to put in as an extension 'test' type. IIRC, there were some needed fixes to Numpy, some of which were postponed in favor of larger changes. User types is one of the things we want ot get fixed up. It would be great to have a quaternion dtype available in numpy, so I would be interested in carrying this package if nobody else steps forward. I don't have any experience with numpy internals, but it looks like most the heavy lifting is done already. On a related note the AstroPy project has been discussing a time class suitable for astronomy (with different conversions, time systems, an option to use 128-bit precision, etc). We have recently talked about a numpy dtype analogous to datetime64. This might be an opportunity to understand a bit the mechanics of making a new dtype. Cheers, Tom Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
[Numpy-discussion] Quaternion data type
Hello everyone, what is the plan for Quaternion data types in numpy? I saw that during last years SciPy spring https://github.com/martinling/numpy_quaternion was started, but not updated or released since then. Thanks Ilan ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
Hi Ilan On Fri, May 4, 2012 at 3:38 PM, Ilan Schnell ischn...@enthought.com wrote: Hello everyone, what is the plan for Quaternion data types in numpy? I saw that during last years SciPy spring https://github.com/martinling/numpy_quaternion was started, but not updated or released since then. That was Martin Ling, link and thread here http://mail.scipy.org/pipermail/numpy-discussion/2011-July/057675.html. I'm not sure what happened with this but I suspect we are waiting for extension types to be fixed up in master. Mark had some thoughts along those lines. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Quaternion data type
Hi Chuck, thanks for the prompt reply. I as curious because because someone was interested in adding http://pypi.python.org/pypi/Quaternion to EPD, but Martin and Mark's implementation of quaternions looks much better. - Ilan On Fri, May 4, 2012 at 5:36 PM, Charles R Harris charlesr.har...@gmail.com wrote: Hi Ilan On Fri, May 4, 2012 at 3:38 PM, Ilan Schnell ischn...@enthought.com wrote: Hello everyone, what is the plan for Quaternion data types in numpy? I saw that during last years SciPy spring https://github.com/martinling/numpy_quaternion was started, but not updated or released since then. That was Martin Ling, link and thread here . I'm not sure what happened with this but I suspect we are waiting for extension types to be fixed up in master. Mark had some thoughts along those lines. Chuck ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion ___ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
