Mailman 3 December 2007 - NumPy-Discussion

Mailing list was not sending out new mails for awhile.
by Travis E. Oliphant 20 Dec '07

20 Dec '07

Hi all, The postfix service on the server hosting several of the mailing lists was down since Monday. Mails to the list were preserved and archived but were not being distributed to subscribers. We restarted the postfix service and messages should now be going out. Apologies for the problem. -Travis O.

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Changing the distributed binary for numpy 1.0.4 for windows ?
by David Cournapeau 19 Dec '07

19 Dec '07

Hi, Several people reported problems with numpy 1.0.4 (See #627 and #628, but also other problems mentionned on the ML, which I cannot find). They were all solved, as far as I know, by a binary I produced (simply using mingw + netlib BLAS/LAPACK, no ATLAS). Maybe it would be good to use those instead ? (I can recompile them if there is a special thing to do to build them) cheers, David

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Float and math module enhancements for Python 2.6 and 3.0
by Christian Heimes 18 Dec '07

18 Dec '07

Hello! The Python core developers are currently working on several improvements for floats and the math module. Since you are "power users" I like to get your opinion and suggestions on several patches: http://bugs.python.org/issue1534 -- sys.float_info [done] http://bugs.python.org/issue1580 -- shorter repr of floats http://bugs.python.org/issue1635 -- platform independent representation and creation of +/-inf and nan http://bugs.python.org/issue1640 -- additional functions for the math module new: sys.maxsize, gone in 3.0: sys.maxint Christian

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Changes to the NumPy's developer trac site
by Jarrod Millman 17 Dec '07

17 Dec '07

Hello, It looks like the spammers have figured out how to use our trac site again. I locked down the trac site a bit to make it more difficult for them. Basically, I removed some of the default permissions that all users get. I don't think this will effect many people; but if you have a trac acount and aren't able to do something because you don't have permission just send me an email. Thanks, -- Jarrod Millman Computational Infrastructure for Research Labs 10 Giannini Hall, UC Berkeley phone: 510.643.4014 http://cirl.berkeley.edu/

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assign a variable to each column of an array
by elfnor 17 Dec '07

17 Dec '07

Is there a more concise way of assigning a variable to each column of an array? This works x,y,z = X[:,0],X[:,1],X[:,2] but seems clumsy.

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Re: [Numpy-discussion] RAdian <--> degres conversion
by Neil Crighton 16 Dec '07

16 Dec '07

Do we really need these functions in numpy? I mean it's just multiplying/dividing the value by pi/180 (who knows why they're in the math module..). Numpy doesn't have asin, acos, or atan either (they're arcsin, arcos and arctan) so it isn't a superset of the math module. I would like there to be fewer functions in numpy, not more. > > Someone on the wxPython list just pointed out that the math module now > > includes includes angle-conversion utilities: > > > >>>> degrees.__doc__ > > degrees(x) -> converts angle x from radians to degrees > >>>> radians.__doc__ > > radians(x) -> converts angle x from degrees to radians > > > > Not a big deal, but handy. As I generally like to think if numpy as a > > superset of the math module, perhaps is should include these too. > > > Done. >

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matrix multiplication A x, x has some zeros
by dmitrey 15 Dec '07

15 Dec '07

Hi all, I have to get Ax, A is n x n matrix, x is vector of length n. Some coords of x are zeros, so I want to economy time/cputime somehow w/o connecting sparse module from scipy. What's the easiest way to do so? Thx, D.

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RAdian <--> degres conversion
by Christopher Barker 15 Dec '07

15 Dec '07

HI all, Someone on the wxPython list just pointed out that the math module now includes includes angle-conversion utilities: >>> degrees.__doc__ degrees(x) -> converts angle x from radians to degrees >>> radians.__doc__ radians(x) -> converts angle x from degrees to radians Not a big deal, but handy. As I generally like to think if numpy as a superset of the math module, perhaps is should include these too. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker(a)noaa.gov

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ANN: SFE-00.35.01
by Robert Cimrman 14 Dec '07

14 Dec '07

Let me announce SFE-00.35.01, bringing per term integration - now each term can use its own quadrature points. This is a major change at the heart of the code - some parts may not work as all terms were not migrated yet to the new framework. All test examples work, though, as well as acoustic band gaps. See http://ui505p06-mbs.ntc.zcu.cz/sfe . SFE is a finite element analysis software written almost entirely in Python. The code is released under BSD license. best regards, r.

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Traceback on divide by zero error
by Tony S Yu 14 Dec '07

14 Dec '07

Hello, This is something that's been bothering for awhile. When numpy raises the following divide by zero error: >>> Warning: divide by zero encountered in double_scalars is there a way to get a Traceback on where that warning occurred. Thanks, Tony

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NumPy-Discussion December 2007