Mailman 3 July 2007 - SciPy-Dev

ANN: SciPy Conference Early Registration Reminder
by Travis Vaught July 6, 2007

July 6, 2007

Greetings, The *SciPy 2007 Conference on Scientific Computing with Python* early registration deadline is July 15, 2007. After this date, the price for registration will increase from $150 to $200. More information on the Conference is here: http://www.scipy.org/ SciPy2007 The registration page is here: https://www.enthought.com/scipy07/ The Conference is to be held on August 16-17. Tutorial Sessions are being offered on August 14-15 (http://www.scipy.org/SciPy2007/ Tutorials). The price to attend Tutorials is $75. The Saturday following the Conference will hold a Sprint session for those interested in pitching in on particular development efforts. (suggestions welcome: http://www.scipy.org/SciPy2007/Sprints) Today is the deadline for abstract submissions for those wanting to present at the conference. Please email to abstracts(a)scipy.org by midnight US Central Time. From the conference web page: "If you are using Python in Scientific Computing, we'd love to hear from you. If you are interested in presenting at the conference, you may submit an abstract in Plain Text, PDF or MS Word formats to abstracts(a)scipy.org -- the deadline for abstract submission is July 6, 2007. Papers and/or presentation slides are acceptable and are due by August 3, 2007. Presentations will be allowed 30-35 minutes, depending on the final schedule." We're looking forward to another great gathering. Best, Travis

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Implementing a distance matrix between two sets of vectors concept
by David Cournapeau July 5, 2007

July 5, 2007

Hi, for my machine learning toolbox, I need the concept of distance matrix, that is for two sets of vectors v and u (N u and M v), of dimension d, I want to compute the matrix D such as d(i,j) = distance(v_i, u_j). This is easy to do in numpy, but for big datasets, this becomes difficult without a significance loss of efficiency or big memory consumption. So I am thinking about implementing it in C. I think the overall concept is useful for other people, so before implementing something, I was wondering if other people would need/use it, and what would they need: - several distance (Euclidian, Mahalanobis, etc...), which would be a separate object to handle different sets of parameters. - C Api ? - datatypes ? Layout ? Contiguity ? - handling Nan ? cheers, David

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numpy.cumproduct() documentation: bug?
by dmitrey July 4, 2007

July 4, 2007

help(cumproduct) says: Help on function cumproduct in module numpy.core.fromnumeric: cumproduct(x, axis=None, dtype=None, out=None) Sum the array over the given axis. however, cumproduct([1,2,3,4]) yields array([ 1, 2, 6, 24]) Btw, what is the difference between cumproduct and cumprod, prod and product? also, I think it would be nice to add cumsum, cumprod, diff to http://www.scipy.org/NumPy_for_Matlab_Users page D. P.S. doc for numpy.i0(x) and numpy.require() is missing. All the data above has been taken from http://www.scipy.org/Numpy_Example_List_With_Doc

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equivalent to online Octave calculator?
by dmitrey July 2, 2007

July 2, 2007

Hi all, has numpy/scipy project something equivalent to online Octave calculator? http://www.online-utility.org/math/math_calculator.jsp If no, I guess it would be very useful for checking numpy/scipy bugs - are those related to user's old scipy/numpy version or they are due to build options and/or lack of some libraries (atlas, blas, lapack etc; or due to their obsolete versions installed). Also, I think it would be very useful and convenient if there will be radiobutton provided which version to use: either latest release or nightly build. (or maybe some scipy releases + some numpy releases, including nightly builds). Also, scikits might be connected in future to the frame; and some limits could be implemented (for example, no more than 60 sec cputime per day from single IP) So, what are your suggestions? Regards, Dmitrey.

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[scikits] setuptools, tests and subpackages
by David Cournapeau July 2, 2007

July 2, 2007

Hi, I would like to know if anyone knowledgable about setuptools knows the best way to tell setuptools how to call unittests in a packages containing subpackages ? In a scipy package, having a test function in __init__ is enough to get the unittests added to the whole scipy test suite, but with setuptools, how do I do that ? cheers, David

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