Mailman 3 March 2014 - NumPy-Discussion

Re: [Numpy-discussion] GSoC 2014 NumPy
by Leo Mao March 5, 2014

March 5, 2014

Hello Ray, Thanks for your suggestion! I just read the links you provided and I think I can implement it as long as I do further research on zoom fft algorithm. So I wonder if this can be a GSoC project? Maybe I should extend this idea or combine it with other ideas? BTW, just for curiosity, why we need both scipy.linalg and numpy.linalg? Is implementing all functions in numpy a bad idea? Regards, Leo Mao

2 3

EuroSciPy 2014 Call for Abstracts
by Ralf Gommers March 5, 2014

March 5, 2014

Dear all, EuroSciPy 2014, the Seventh Annual Conference on Python in Science, takes place in Cambridge, UK on 27 - 30 August 2013. The conference features two days of tutorials followed by two days of scientific talks. The day after the main conference, developer sprints will be organized on projects of interest to attendees. The topics presented at EuroSciPy are very diverse, with a focus on advanced software engineering and original uses of Python and its scientific libraries, either in theoretical or experimental research, from both academia and the industry. The program includes keynotes, contributed talks and posters. Submissions for talks and posters are welcome on our website (http://www. euroscipy.org/2014/). In your abstract, please provide details on what Python tools are being employed, and how. The deadline for submission is 14 April 2013. Also until 14 April 2014, you can apply for a sprint session on 31 August 2014. See https://www.euroscipy.org/2014/calls/sprints/ for details. Important dates: April 14th: Presentation abstracts, poster, tutorial submission deadline. Application for sponsorship deadline. May 17th: Speakers selected May 22nd: Sponsorship acceptance deadline June 1st: Speaker schedule announced June 6th, or 150 registrants: Early-bird registration ends August 27-31st: 2 days of tutorials, 2 days of conference, 1 day of sprints We look forward to an exciting conference and hope to see you in Cambridge in August! The EuroSciPy 2014 Team http://www.euroscipy.org/2014/ Conference Chairs -------------------------- Mark Hayes, Cambridge University, UK Didrik Pinte, Enthought Europe, UK Tutorial Chair ------------------- David Cournapeau, Enthought Europe, UK Program Chair -------------------- Ralf Gommers, ASML, The Netherlands Program Committee ----------------------------- Tiziano Zito, Humboldt-Universität zu Berlin, Germany Pierre de Buyl, Université libre de Bruxelles, Belgium Emmanuelle Gouillart, Joint Unit CNRS/Saint-Gobain, France Konrad Hinsen, Centre National de la Recherche Scientifique (CNRS), France Raphael Ritz, Garching Computing Centre of the Max Planck Society, Germany Stéfan van der Walt, Applied Mathematics, Stellenbosch University, South Africa Gaël Varoquaux, INRIA Parietal, Saclay, France Nelle Varoquaux, Mines ParisTech, France Pauli Virtanen, Aalto University, Finland Evgeni Burovski, Lancaster University, UK Robert Cimrman, New Technologies Research Centre, University of West Bohemia, Czech Republic Almar Klein, Cybermind, The Netherlands Organizing Committee ------------------------------ Simon Jagoe, Enthought Europe, UK Pierre de Buyl, Université libre de Bruxelles, Belgium

2 3

Implementing Levenberg-Marquardt with additional feature
by Sudheer Singh March 5, 2014

March 5, 2014

Hello Everyone !! I am Sudheer singh , an information technology student at IIIT - ALLAHABAD. I'm interested in contributing to Numpy.I was going through Idea page and I found Implementing "Levenberg-Marquardt " with additional feature like inequality constraints and sparse Jacobian matrix.

2 1

ndarray is not a sequence
by Anthony Scopatz March 4, 2014

March 4, 2014

Hello All, The semantics of this seem quite insane to me: In [1]: import numpy as np In [2]: import collections In [4]: isinstance(np.arange(5), collections.Sequence) Out[4]: False In [6]: np.version.full_version Out[6]: '1.9.0.dev-eb40f65' Is there any possibility that ndarray could inherit (in the last place) from collections.Sequence? It seems like this would only be a 1 - 5 line fix somewhere. I just spent a few hours tracking down a bug related to this. Thanks for considering! Be Well Anthony

7 10

How security holes happen
by Charles R Harris March 4, 2014

March 4, 2014

This is from OS X 9 if ((err = SSLHashSHA1.update(&hashCtx, &serverRandom)) != 0) goto fail; if ((err = SSLHashSHA1.update(&hashCtx, &signedParams)) != 0) goto fail; goto fail; if ((err = SSLHashSHA1.final(&hashCtx, &hashOut)) != 0) goto fail; Heh, maybe there is a reason for braces in even the simplest if statements. Chuck

7 8

dtype promotion
by Nicolas Rougier March 3, 2014

March 3, 2014

Hi all, I'm using numpy 1.8.0 (osx 10.9, python 2.7.6) and I can't understand dtype promotion in the following case: >>> Z = np.zeros((2,2),dtype=np.float32) + 1 >>> print Z.dtype float32 >>> Z = np.zeros((2,2),dtype=np.float32) + (1,1) >>> print Z.dtype float64 Is this the expected behavior ? What it the difference between the two lines ? Nicolas

4 7

GSOC 2014 : "Improve Numpy datetime functionality"
by faisal anees March 3, 2014

March 3, 2014

Hi , I am Mohammed Faisal Anees , a Computer Science student at IIIT- Hyderabad. I was going though the ideas page and I found "Improve Numpy datetime functionality" really interesting , and it suits my experience as I have a considerable(hopefully !!) amount of experience in C/C++, and Python . Right now I am going through the link suggested by you and the codebase. Thanks

3 2

Installing
by Sze Chai kwok March 3, 2014

March 3, 2014

> I have this message when installing numpy, any ideas? Thanks > -- > Sze Chai Kwok, D.Phil > Neuroimaging Laboratory > Santa Lucia Foundation > Via Ardeatina 306 > 00179 Rome Italy > Tel: +39 06 5150 1459 -- Sze Chai Kwok, D.Phil Neuroimaging Laboratory Santa Lucia Foundation Via Ardeatina 306 00179 Rome Italy Tel: +39 06 5150 1459

2 1

proper way to test Numpy version in C/C++
by Ghislain Vaillant March 3, 2014

March 3, 2014

Hi everyone, I have got code for some python wrappers of a scientific library which needs to support both Numpy 1.6 and later versions. The build of the wrapper (using swig) stopped working because of the deprecated API introduced in v1.7. The error only concerns the renaming of some macros from NPY_XXX to NPY_ARRAY_XXX. I was thinking to just check for the Numpy version at build time and add corresponding #define to provide the necessary renaming in case the build is done with Numpy v1.6. How can I robustly test for Numpy's version API in C ? Ghis

1 1

Suggestions for GSoC Projects
by jennifer stone March 2, 2014

March 2, 2014

With GSoC 2014 being round the corner, I hereby put up few projects for discussion that I would love to pursue as a student. Guidance, suggestions are cordially welcome:- 1. If I am not mistaken, contour integration is not supported by SciPy; in fact even line integrals of real functions is yet to be implemented in SciPy, which is surprising. Though we at present have SymPy for line Integrals, I doubt if there is any open-source python package supporting the calculation of Contour Integrals. With integrate module of SciPy already having been properly developed for definite integration, implementation of line as well as contour integrals, I presume; would not require work from scratch and shall be a challenging but fruitful project. 2. I really have no idea if the purpose of NumPy or SciPy would encompass this but we are yet to have indefinite integration. An implementation of that, though highly challenging, may open doors for innumerable other functions like the ones to calculate the Laplace transform, Hankel transform and many more. 3. As stated earlier, we have spherical harmonic functions (with much scope for dev) we are yet to have elliptical and cylindrical harmonic function, which may be developed. 4. Lastly, we are yet to have Inverse Laplace transforms which as Ralf has rightly pointed out it may be too challenging to implement. 5. Further reading the road-map given by Mr.Ralf, I would like to develop the Bluestein's FFT algorithm. Thanks for reading along till the end. I shall append to this mail as when I am struck with ideas. Please do give your valuable guidance

7 19