Mailman 3 July 2004 - SciPy-User

Help required regding Eigenvectors
by Sudheer Phani March 14, 2022

March 14, 2022

Hello All, I have been encountering some strange problems with the calculation of eigen vectors using python. The problem is with the sign of the eigen vectors calculated. On Very few occasions the eigen vectors calculated using python have an opposite sign than the actual eigenvectors, though the magnitude is correct. Can any one of you plz help me in this regard and suggest me some solution if you have encoutered similar problems . Any help in this regd is appreciated Thanks in Advace regds Sudheer

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Building Debug extrensions with scipy_distutils on WinXP
by Berthold Höllmann Aug. 5, 2004

Aug. 5, 2004

Hello, I'm trying to build a Windows Debug version of an inhouse extension module whose setup.py requires scipy_distutils. I call python_d.exe setup.py config_fc --fcompiler=compaqv build --debug but get ... creating build\temp.win32-2.3\lib\PyBrushMod\flib compile options: '-g -c' DF:f77: lib\PyBrushMod\flib\area3.f DF: error: Switch '-g' is ambiguous error: Command "DF /f77rtl /fixed /nologo /MD /WX /iface=(cref,nomixed_str_len_arg) /names:lowercase /assume:underscore /debug /Ox /fast /optimize:5 /unroll:0 /math_library:fast /threads -g -c /compil e_only lib\PyBrushMod\flib\area3.f /object:build\temp.win32-2.3\lib\PyBrushMod\flib\area3.o" failed with exit status 1 [31863 refs] The strange thing for me is, when I look into 'compaqfcompiler.py' I find the class 'CompaqVisualFCompiler' which defines def get_flags_debug(self): return ['/debug'] but for some strange reason '-g' is inserted. Kind regards Berthold Höllmann -- Germanischer Lloyd AG CAE Development Vorsetzen 35 20459 Hamburg Phone: +49(0)40 36149-7374 Fax: +49(0)40 36149-7320 e-mail: hoel(a)gl-group.com Internet: http://www.gl-group.com This e-mail contains confidential information for the exclusive attention of the intended addressee. Any access of third parties to this e-mail is unauthorised. Any use of this e-mail by unintended recipients such as copying, distribution, disclosure etc. is prohibited and may be unlawful. When addressed to our clients the content of this e-mail is subject to the General Terms and Conditions of GL's Group of Companies applicable at the date of this e-mail. GL's Group of Companies does not warrant and/or guarantee that this message at the moment of receipt is authentic, correct and its communication free of errors, interruption etc.

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plotting question: standardized 2D plot access
by Alan G Isaac July 31, 2004

July 31, 2004

I am a complete Python and SciPy newbie. (A few days.) So far, I am loving both. Is there access to gnuplots 'pause' command via gplt? (I see related questions have been asked: http://www.scipy.org/mailinglists/mailman?fn=scipy-user/2003-May/001631.html ) What is the best way to get a gplt plot produced by a script to display for awhile before running the rest of the script? In the meantime, I've been using gplt happily. I would say only that the default of using the temporary file names in the key (legend) appears undesirable. Thank you, Alan Isaac PS Is there a module, call it plot2D for example, that provides a standardized way to create plot descriptions, which can then be plotted by whatever packages SciPy happens to support? (So that after creating a plot2D object 'myplot' I could myplot.gplt() or myplot.plt() or whatever.) As plotting packages continue to proliferate, I think such a standardized interface would be very helpful. It addition, the current approach requires a redraw each time a feature is changed. This is very nice for interactive use, of course, but not in scripts.

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RandomArray behaving nondeterministically
by bulatov＠cs.orst.edu July 30, 2004

July 30, 2004

For some reason RandomArray gives different results when initialized with the same seed. IE >>> import RandomArray as r >>> r.seed(0,0) >>> r.uniform(0,1,(3,3)) array([[ 0.9445683 , 0.81778226, 0.27272533], [ 0.53688906, 0.27386963, 0.39699606], [ 0.83909219, 0.66436204, 0.23828671]]) >>> r.seed(0,0) >>> r.uniform(0,1,(3,3)) array([[ 0.94409458, 0.54127862, 0.78580418], [ 0.74310646, 0.67297207, 0.6716389 ], [ 0.60675857, 0.54727364, 0.67690952]]) Is that a feature, or a bug? Yaroslav

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Conference Schedule Online
by Travis Oliphant July 30, 2004

July 30, 2004

The preliminary conference schedule for SciPy2004 is now online. You can view it at: http://www.scipy.org/wikis/scipy04/ConferenceSchedule See you in Pasadena, -Travis Oliphant

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ATLAS building
by Stephen Walton July 29, 2004

July 29, 2004

I recently found that the instructions for building LAPACK and ATLAS for use with SciPy are quite different in the INSTALL.txt which is part of the SciPy distribution and the Web page at http://www.scipy.org/documentation/buildatlas4scipy.txt. In particular, the Web seems to want one to download and compile the Fortran BLAS from NETLIB, whereas the instructions in INSTALL.txt will use the C BLAS and the Fortran interface to same which is part of ATLAS. Which gives better results? Which is 'correct?' -- Stephen Walton <stephen.walton(a)csun.edu> Dept. of Physics & Astronomy, Cal State Northridge

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ANN: IPython 0.6.1 is officially out
by Fernando Perez July 27, 2004

July 27, 2004

[Please forgive the cross-post, but since I know many scipy/numpy users are also ipython users, and this is a fairly significant update, I decided it was worth doing it.] Hi all, I've just uplodaded officially IPython 0.6.1. Many thanks to all who contributed comments, bug reports, ideas and patches. I'd like in particular to thank Ville Vainio, who helped a lot with many of the features for pysh, and was willing to put code in front of his ideas. As always, a big Thank You goes to Enthought and the Scipy crowd for hosting ipython and all its attending support services (bug tracker, mailing lists, website and downloads, etc). The download location, as usual, is: http://ipython.scipy.org/dist A detailed NEWS file can be found here: http://ipython.scipy.org/NEWS, so I won't repeat it. I will only mention the highlights of this released compared to 0.6.0: * BACKWARDS-INCOMPATIBLE CHANGE: Users will need to update their ipythonrc files and replace '%n' with '\D' in their prompt_in2 settings everywhere. Sorry, but there's otherwise no clean way to get all prompts to properly align. The ipythonrc shipped with IPython has been updated. * 'pysh' profile, which allows you to use ipython as a system shell. This includes mechanisms for easily capturing shell output into python strings and lists, and for expanding python variables back to the shell. It is started, like all profiles, with 'ipython -p pysh'. The following is a brief example of the possibilities: planck[~/test]|3> $$a=ls *.py planck[~/test]|4> type(a) <4> <type 'list'> planck[~/test]|5> for f in a: |.> if f.startswith('e'): |.> wc -l $f |.> 113 error.py 9 err.py 2 exit2.py 10 exit.py You can get the necessary profile into your ~/.ipython directory by running 'ipython -upgrade', or by copying it from the IPython/UserConfig directory (ipythonrc-pysh). Note that running -upgrade will rename your existing config files to prevent clobbering them with new ones. This feature had been long requested by many users, and it's at last officially part of ipython. * Improved the @alias mechanism. It is now based on a fast, lightweight dictionary implementation, which was a requirement for making the pysh functionality possible. A new pair of magics, @rehash and @rehashx, allow you to load ALL of your $PATH into ipython as aliases at runtime. * New plot2 function added to the Gnuplot support module, to plot dictionaries and lists/tuples of arrays. Also added automatic EPS generation to hardcopy(). * History is now profile-specific. * New @bookmark magic to keep a list of directory bookmarks for quick navigation. * New mechanism for profile-specific persistent data storage. Currently only the new @bookmark system uses it, but it can be extended to hold arbitrary picklable data in the future. * New @system_verbose magic to view all system calls made by ipython. * For Windows users: all this functionality now works under Windows, but some external libraries are required. Details here: http://ipython.scipy.org/doc/manual/node2.html#sub:Under-Windows * Fix bugs with '_' conflicting with the gettext library. * Many, many other bugfixes and minor enhancements. See the NEWS file linked above for the full details. Enjoy, and please report any problems. Best, Fernando Perez.

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fsolve side affecting output
by matt July 27, 2004

July 27, 2004

optimize.fsolve returns the inputs that result in a zero for the function it is passed. It doesn't, however, throw an exception or give a special return value when it dumps one of these warnings to standard out. Is there a way to supress the dumps to std out? I still want my print commands to be visible, so I can't just redirect everything that goes to std out. Does anyone know if there are plans to add an exception or success code to the output of this function? -Matt

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scipy compilation
by Olivier Ravard July 26, 2004

July 26, 2004

Hi, Is someone knows how to compile scipy without using ATLAS ? Thanks. O.R.

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ANN: SciPy04 -- Last day for abstracts and early registration!
by eric jones July 23, 2004

July 23, 2004

Hey Group, Just a reminder that this is the last day to submit abstracts for SciPy04. It is also the last day for early registration. More information is here: http://www.scipy.org/wikis/scipy04 About the Conference and Keynote Speaker --------------------------------------------- The 1st annual *SciPy Conference* will be held this year at Caltech, September 2-3, 2004. As some of you may know, we've experienced great participation in two SciPy "Workshops" (with ~70 attendees in both 2002 and 2003) and this year we're graduating to a "conference." With the prestige of a conference comes the responsibility of a keynote address. This year, Jim Hugunin has answered the call and will be speaking to kickoff the meeting on Thursday September 2nd. Jim is the creator of Numeric Python, Jython, and co-designer of AspectJ. Jim is currently working on IronPython--a fast implementation of Python for .NET and Mono. Presenters ----------- We still have room for a few more standard talks, and there is plenty of room for lightning talks. Because of this, we are extending the abstract deadline until July 23rd. Please send your abstract to abstracts(a)scipy.org. Travis Oliphant is organizing the presentations this year. (Thanks!) Once accepted, papers and/or presentation slides are acceptable and are due by August 20, 2004. Registration ------------- Early registration ($100.00) has been extended to July 23rd. Follow the links off of the main conference site: http://www.scipy.org/wikis/scipy04 After July 23rd, registration will be $150.00. Registration includes breakfast and lunch Thursday & Friday and a very nice dinner Thursday night. Please register as soon as possible as it will help us in planning for food, room sizes, etc. Sprints -------- As of now, we really haven't had much of a call for coding sprints for the 3 days prior to SciPy 04. Below is the original announcement about sprints. If you would like to suggest a topic and see if others are interested, please send a message to the list. Otherwise, we'll forgo the sprints session this year. We're also planning three days of informal "Coding Sprints" prior to the conference -- August 30 to September 1, 2004. Conference registration is not required to participate in the sprints. Please email the list, however, if you plan to attend. Topics for these sprints will be determined via the mailing lists as well, so please submit any suggestions for topics to the scipy-user list: list signup: http://www.scipy.org/mailinglists/ list address: scipy-user(a)scipy.org thanks, eric

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