Mailman 3 November 2009 - NumPy-Discussion

convert strides/shape/offset into nd index?
by Zachary Pincus Dec. 1, 2009

Dec. 1, 2009

Hi all, I'm curious as to what the most straightforward way is to convert an offset into a memory buffer representing an arbitrarily strided array into the nd index into that array. (Let's assume for simplicity that each element is one byte...) Does sorting the strides from largest to smallest and then using integer division and mod (in the obvious way) always work? (I can't seem to find a counterexample, but I am not used to thinking too deeply about bizarrely-strided configurations.) Is there a method that doesn't involve sorting? Thanks, Zach

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Is anyone knowledgeable about dll deployment on windows ?
by David Cournapeau Dec. 1, 2009

Dec. 1, 2009

Hi, My head hurt trying to understand dll management with windows. I wanted to find a sane way to use dll for numscons, but I can't see how to do this, so I was wondering if anyone on this ML had any deep knowledge on how to install dll, and reuse them with python extensions ? The problem is the following: - you have some dll (say MKL) in a path (say C:\program files\MKL). - how do you tell another dll (more exactly a python extension, a .pyd) to look for mkl dll into the MKL path ? It seems that there is no rpath-like capability on windows, and the only way to load dll is to put them into some windows directory, or to put the dll path into PATH. Is it really the only way ? cheers, David

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Packaging numpy with py2app v0.4.3
by Donovan Parks Nov. 30, 2009

Nov. 30, 2009

Hello, I am trying to package a simple python script which uses numpy using py2app. There was a lengthy discussion about this back in 2006 on this list, but it doesn't seem relevant anymore given the changes to numpy and py2app over the last few years. I am hoping someone on this list has experience with py2app and can give me a hand. My system is as follows: OS X Leopard MacPort Python 2.6.4 (installed via MacPort two days ago) py26-py2app 0.4.3 (installed via MacPort two days ago) py26-numpy 1.3.0 (installed via MacPort two days ago) The minimal numpy script I've been working with is: from numpy import array a = array( [ 10,20,30,40 ] ) print a I've been trying to package this with numpy using the following setup.py file: from setuptools import setup APP = ['numpyTest.py'] OPTIONS = {'argv_emulation': True} setup( app=APP, options={'py2app': OPTIONS}, setup_requires=['py2app'], ) When I run 'python setup.py py2app' I get the following error after py2app starts stripping out debug information: /usr/bin/strip: for architecture i386 object: /Users/dparks/test/dist/numpyTest.app/Contents/Frameworks/libgcc_s.1.dylib truncated or malformed object (LC_SEGMENT command 2 fileoff field plus filesize field extends past the end of the file) stripping saved 2592052 bytes (32431544 / 35023596) A numpyTest.app file is created in the dist directory. However, when I try to run this file I get the following error: ZipImportError: can't decompress data; zlib not available I tried --no-strip which does cause a clean 'build' from py2app, but I still get the same error message about zlib. Explicitly adding zlib to setup.py doesn't change anything. I've also tried going into numpyTest.app and unzipping the site-packages.zip file, but again this makes no difference. I'm at a bit of a lost at what to try next since my understanding is that py2app has a built-in recipe for numpy so should more-or-less work out of the box. Any insight into what the stripping error relates to? Perhaps I am missing something simple here. Does one need to explictly tell py2app what recipes to use (the documentation doesn't make it sound that way)? Do I need to explicitly indicate I have a 32-bit or 64-bit system (actually not sure what it is at the moment)? Thanks for any and all help. Regards, Donovan

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Computing Simple Statistics When Only they Frequency Distribution is Known
by Wayne Watson Nov. 30, 2009

Nov. 30, 2009

How do I compute avg, std dev, min, max and other simple stats if I only know the frequency distribution? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet 350 350 350 350 350 350 350 350 350 350 Make the number famous. See 350.org The major event has passed, but keep the number alive. Web Page: <www.speckledwithstars.net/>

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Producing a Histogram When Bins Are Known
by Wayne Watson Nov. 29, 2009

Nov. 29, 2009

I have a list that already has the frequencies from 0 to 255. However, I'd like to make a histogram that has say 32 bins whose ranges are 0-7, 8-15, ... 248-255. Is it possible? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet 350 350 350 350 350 350 350 350 350 350 Make the number famous. See 350.org The major event has passed, but keep the number alive. Web Page: <www.speckledwithstars.net/>

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A Simple Example of histogram Using Range?
by Wayne Watson Nov. 29, 2009

Nov. 29, 2009

See Subject. I don't seem able to produce a simple example of using (Matplotlib) histogram that uses range. I tried a variety of ranges, range=(5,22), range=(0, 50.2), ... and I see no difference between any of the x values scale on the plot. Can someone provide an example that shows how it works? -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet 350 350 350 350 350 350 350 350 350 350 Make the number famous. See 350.org The major event has passed, but keep the number alive. Web Page: <www.speckledwithstars.net/>

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Re: [Numpy-discussion] Installing numpy under cygwin
by Olivia Cheronet Nov. 28, 2009

Nov. 28, 2009

Hello, I attempted to install Numpy for my Cygwin python again, by simply executing: >python setup.py install However, I now get the following: >File "numpy/core/setup.py", line 253, in check_mathlib > raise EnvironmentError("math library missing; rerun " >EnvironmentError: math library missing; rerun setup.py after setting the MATHLIB >env variable I have a math library from cygwin (libm.a), but I have not managed to set it. How should I set this? Thank you for the help, Olivia ----- Original Message ---- > From: David Cournapeau > To: Discussion of Numerical Python > Sent: Wed, November 18, 2009 9:01:06 AM > Subject: Re: [Numpy-discussion] Installing numpy under cygwin > > Olivia Cheronet wrote: > > Hello. > > > > I am currently trying to install the latest version of NumPy for my cygwin > Python, and I am having problems... > > > > I have downloaded the source, and unzipped and untarred it in my home > directory. > > Subsequently, I included the following in the site.cfg file: > > > >> [DEFAULT] > >> library_dirs = /cygdrive/c/cygwin/lib > >> include_dirs = /cygdrive/c/cygwin/usr/local/include > >> [blas_opt] > >> libraries = f77blas, cblas, atlas > >> [lapack_opt] > >> libraries = lapack, f77blas, cblas, atlas > >> > > > > In the Cygwin bash shell, after going to my home directory, I have executed: > > python setup.py config --compiler=mingw32 build --compiler=mingw32 install > > as instructed in the "Installing SciPy/Windows" page. > > > > If you use cygwin, you should not follow the windows instructions. For > most purposes, cygwin works as unix. In particular, you don't think you > should not use mingw32 build on cygwin. The -mno-cygwin flag appended to > gcc is most likely coming from there, and this looks very wrong for a > cygwin build. > > David > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion(a)scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion

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Numpy trunk and 1.4.x branch fail to build with VS2008
by Christoph Gohlke Nov. 28, 2009

Nov. 28, 2009

The current numpy sources from svn trunk (r7772 or newer) and the 1.4.x branch fail to build with Visual Studio 2008 with the following compiler error: numpy\core\src\multiarray\descriptor.h(16) : error C2133: '_datetime_strings' : unknown size A quick fix is to specify the size of the _datetime_strings array, e.g. _datetime_strings[14]. Christoph

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matrix inverse
by josef.pktd＠gmail.com Nov. 27, 2009

Nov. 27, 2009

why is http://docs.scipy.org/numpy/docs/numpy.matrixlib.defmatrix.matrix.I/ classified as unimportant? .T ? I was looking at http://projects.scipy.org/numpy/ticket/1093 and didn't find any docs for the matrix inverse. Josef

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New behavior for correlate w.r.t. swapped input: deprecate current default for 1.4.0 ?
by David Cournapeau Nov. 27, 2009

Nov. 27, 2009

Hi, The function correlate can now implement what is generally accepted as the definition of correlation, but you need to request this behavior ATM (by default, it still does the wrong thing). Is it ok to deprecate the default ? I.e. the behavior is exactly the same, but we warn users about the change, and in 1.5.0, the default is to use the new behavior. cheers, David

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