Mailman 3 July 2003 - SciPy-User

Use and abuse of floating point operations
by Nils Wagner July 28, 2003

July 28, 2003

Hi all, I would like to compare two different algorithms with respect to their performance. What is a suitable measure for that task and what is obsolete ? Any suggestion ? Nils

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TypeError: object has read-only attributes
by Nils Wagner July 25, 2003

July 25, 2003

Hi all, I would like to change an entry of a complex array. >>> t array([ 0.30993965+0.21102825j, 0.40232318+0.48098591j, 0.30927754+0.3310895j , 0.36197345+0.36041015j]) >>> t[0] (0.30993964566340926+0.21102825078044135j) >>> t[0].real 0.30993964566340926 >>> t[0].real=0 Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: object has read-only attributes >>> t[0]=1 >>> t[0] (1+0j) >>> What's the trouble ? Nils

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[ANN] SciPy 03 Workshop - Scientific Computing with Python
by Travis N. Vaught July 25, 2003

July 25, 2003

------------------ SciPy '03 Workshop ------------------ The SciPy '03 Workshop on Scientific Computing with Python is being held at Cal Tech again this year. Online registration is now available. After last year's success, we expect another great turnout with compelling presentations/tutorials. It is a two day workshop held September 11-12 in Pasadena, CA. More information may be found at: http://www.scipy.org/site_content/scipy03 Online registration is available at: https://www.enthought.com/scipy03 Please register early. Last minute registrants will have to suffer the indignity of a handwritten name tag. It currently looks like breakfast (bagels, etc.), lunch and supper will be provided Thursday, and breakfast and lunch will be provided Friday. Discussion about the workshop may be directed to the SciPy-user mailing list (http://www.scipy.org/site_content/MailList) to which you may post messages at scipy-user(a)scipy.org. Presenters: If you would like to present at the workshop, there are two formats: - Lightning Talks: Short (5-15 minute) presentations of a particular scientific problem solved with Python. - Presentations: Traditional presentation format ~45 minute talks. If you would like to present, contact Eric Jones at eric(a)enthought.com. For any other questions, please feel free to call or email Travis Vaught: travis(a)enthought.com, (512)536-1057. You can call the same number to register via phone (Business Hours CST). Links: SciPy.org community site: http://www.scipy.org Workshop Home: http://www.scipy.org/site_content/scipy03 Summary of last year's workshop: http://www.scipy.org/site_content/scipy02/scipy02summary.htm

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How to submit a paper
by Paul F. Kunz July 25, 2003

July 25, 2003

I'm interested in submitting a paper to SciPy '03. How to I do that? This list seems to be the only contact point to thw workshop.

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K-MEANS ALGORITHM(ASKING)
by 손은하 July 23, 2003

July 23, 2003

Hi I Have stuck up with a project based on clustering using K-Means algorithm Please help me find the relevent C code for theK-Means algorithm Regards

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xplt.plot
by Nils Wagner July 23, 2003

July 23, 2003

Hi all, How can I plot two curves on two different graphs with xplt ? A small example would be appreciated. Thanks in advance, Nils

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chaco
by philippe.dalet＠voila.fr July 23, 2003

July 23, 2003

under win2k and py22 and wxPythonWIN32-2.4.1.2-Py22.exe I've downloaded the last update of sciPy (SciPy-0.2.0_alpha_202.4187.win32-py2.2.exe) and I could not execute chaco wx_plt_demo.py If I setup the version of chaco (installer) It runs. If I run a simple demo I have a system memory bug. before all was running. Do You know this bug ? Thanks a lot DALET philippe Laboratoire STS électronique Lyp champollion avenue pezet 46100 FIGEAC FRANCE ------------------------------------------ Faites un voeu et puis Voila ! www.voila.fr

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Matrix Arithmetic
by Colin J. Williams July 18, 2003

July 18, 2003

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using scipy.stats.distributions
by Christopher Fonnesbeck July 17, 2003

July 17, 2003

Is there a tutorial or some examples on how to use the distributions in scipy.stats? I am putting together some Markov chain Monte Carlo code, and need to use several different distributions, but cannot get the hang of distribution classes (e.g. setting parameters, generating values). Thanks, chris -- Christopher J. Fonnesbeck (chris at fonnesbeck dot org) GA Coop. Fish & Wildlife Research Unit, University of Georgia

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linalg.lu_factor
by Nils Wagner July 17, 2003

July 17, 2003

Hi all, How can I use linalg.lu_factor to compute the determinant of a matrix A ? Of course I know, that I can use linalg.det(A) directly. detA = linalg.det(A) d,piv = linalg.lu_factor(A) Afaik prod(diag(d)) is the determinant except the sign. Am I missing something ? How do I find the sign of det(A) Nils

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