Pauli Virtanen | 24 Apr 22:38 2016
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PR adding boundary value problem solver in scipy

Hi,

I'd like to draw attention to a PR from Nikolay adding a BVP problem 
solver to Scipy. If this is interesting to you, maybe try it out:

https://github.com/scipy/scipy/pull/6025

	Pauli
WESLEY WANG | 19 Apr 00:47 2016
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coding project

Hi All! 

My name is Wesley Wang and I am currently working on a project for our class which involves helping contribute to a project. While I was looking through a list of projects, I became very interested in SciPy, which combines coding with math and science. 

Is there anything which I can possibly contribute to in terms of code? (As a chemistry major, I'm looking to maybe add or change some things in the constants.py file involving constants commonly used in chemistry) 

Any feedback would be nice! 
Thanks and have a great day! 

-Wesley
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Boris Faleichik | 17 Apr 19:10 2016
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On an example problem from optimize/nonlin.py

Dear all,

my question is addressed to the authors of https://github.com/scipy/scipy/blob/master/scipy/optimize/nonlin.py

I am looking for more detailed description of the nonlinear integro-differential equation which is a test problem for Newton-Krylov iteration in the documentation:

\nabla^2 P = 10 \left(\int_0^1\int_0^1\cosh(P)\,dx\,dy\right)^2

As a computational scientist I would like to know the origin of this problem and possibly to get some references on related scientific papers.

Thank you very much!

Best,
Boris
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Tyler Reddy | 15 Apr 12:22 2016
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Adding surface area calculation for spherical polygons

Hi,

I've opened an issue (https://github.com/scipy/scipy/issues/6069) that describes and demonstrates code for calculating the surface areas of spherical polygons. It would be helpful to have some input--I've put sample results there and linked to a github with Dockerfile, etc. for reproducing the results / modifying code if needed.

Thanks,
Tyler
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Thomas Haslwanter | 11 Apr 18:25 2016
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scikit-kinematics released

I have gone ahead, and released my 3D kinematics routines (working with rotation matrices and quaternions, analyzing data from IMUs and from marker-based tracker systems, etc) as an open-source project.

I still have one problem, where I would really appreciate assistance: the documentation builds cleanly on my system, under Windows as well as under Linux. However, when I build the documentation on https://readthedocs.org/, the descriptions of the functions in the modules are not built. It looks as if readthedocs ignores the sphinx-command "func". Check for example the link  for quat.quatmult

on http://work.thaslwanter.at/skinematics/html/quat.html (correctly working)

and on http://scikit-kinematics.readthedocs.org/en/latest/quat.html (link not working)

If you have had any experience with readthedocs and have an idea what the problem could be, please let me know.

Thanks, thomas



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Evgeni Burovski | 10 Apr 19:53 2016
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scipy 0.17.1 release

Hi,

I'm planning to cut the point release of scipy 0.17.1 by the end of this week.
Thoughts?

Regressions in 0.17.0 so far seem reasonably mild:
https://github.com/scipy/scipy/milestones/0.17.1
If there's anything else you think should be included in 0.17.1,
please mention it in this email thread or on Github.

Cheers,

Evgeni
Ian Henriksen | 10 Apr 08:25 2016
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Increasing Minimum Required LAPACK Version

Hi everyone,
I've opened a pull request (https://github.com/scipy/scipy/pull/6051) to increase the
minimum required LAPACK version to 3.3.1 rather than 3.1.0.

Here's some context. 3.1.0 was released on November 12, 2006. 3.3.1 was
released on April 18 2011. 3.3.1 is also the LAPACK version available by default on
the Travis CI build workers.

There are several advantages to doing this. It lets us avoid running into bugs in
older LAPACK versions (one example is
https://github.com/scipy/scipy/issues/5039). It also allows us to add a significant
number of LAPACK routines to the Cython LAPACK API. The Cython LAPACK API
consists of the routines common to all supported LAPACK versions. Increasing the
minimum requirement all the way up to 3.3.1 gives us access to most of the new
routines added between 3.1.0 and 3.3.1. A full list of the routines this adds is
available in the pull request.

The main change I expect this to make for users is that people using systems
sufficiently old to not have LAPACK 3.3.1 available through the package manager
will now have to build LAPACK from source rather than linking against the LAPACK
provided by their operating system. Given that systems that old are becoming less
common and that many people use more recent optimized implementations of
BLAS and LAPACK, I expect that this won't impact a huge number of people.

Is this a change that makes sense to everyone?

Best,
Ian Henriksen
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Yuri D'Elia | 9 Apr 21:47 2016

PR for signal.planck (Planck-taper and Planck-Bessel window functions)

Hi everyone,

I'd like to bring to your attention this PR:

  https://github.com/scipy/scipy/pull/6012

which implements the Plack-taper window (http://arxiv.org/pdf/1003.2939)
along with tests and documentation.

It's a rarely-used window, with current citations only in the
gravitational-wave field of research. I can definitely see why there
might be reluctance in merging such a rarely used window.

Nevertheless, I'd like to know if there is actual interesting or not, as
I could furthermore provide the implementation of the Planck-Bessel and
Cosine-Hyperbolic windows as well.

Thanks!
Thomas Haslwanter | 9 Apr 18:25 2016
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scikit-kinematics

Hi,
I am thinking about taking all the kinematics-related modules from my library thLib (http://work.thaslwanter.at/thLib/html/#modules), and release it as a new scikit: "scikit-kinematics". Currently there are modules on:
- quaternions
- rotation matrices
- vector calculations
- IMU (inertial measurement units)
- markers (optical tracking systems)
- viewer (for interactively investigating time series)

Any opinion?
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Thomas Haslwanter | 6 Apr 23:02 2016
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thLib - 3D Kinematics and Signal Processing

Hi,
over the last few years I have developed a Python library, primarily aimed at 3D kinematics, signal processing, and miscellaneous small items that I use regularly, like a waitbar. It is currently available at
https://pypi.python.org/pypi?%3Aaction=pkg_edit&name=thLib

Somewhat to my surprise, it has become pretty popular (by my personal standards), with almost 9'000 downloads last month. Since most parts of it are by now quite stable, I am thinking about how best to continue. I can
  1. Make it a github-project, and see who is interested in contributing.
  2. Improve the testing, and release a 1.0 version on my own. (My main limitation is that I don't have a Mac, and testing compatability with Macs is difficult for me.)
  3. Turn it into a "scikit-kinematics" (or some other suitable "scikit"-name) and/or contribute the code to scipy, if others would find it suitable.
I would appreciate feedback and opinions.
Thanks, Thomas
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Andrew Nelson | 5 Apr 05:35 2016
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Edge case bug in stats.triang?

I've been investigating the stats.triang.pdf over it's domain with different modes:

>>> from scipy.stats import triang
>>> triang.pdf(0, 0)
2.0
>>> triang.pdf(1, 1)
nan

Shouldn't the last value be 2?

--
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Dr. Andrew Nelson


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Gmane