Mailman 3 March 2005 - SciPy-User

Python 2.4 Win32 Binaries?
by Matthew Bogosian 21 Mar '05

21 Mar '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 This may have been asked before, but I haven't been able to find a recent reference in the mailing lists. From the installation documentation, under "Building SciPy under MS Windows": > Building Scipy is easy --- that is, provided that you have all > required software installed properly. This may very well be true, but properly installing all the required software is anything but. I know that Python 2.4 has been out for quite some time. Numeric is up to 23.8 now. If building SciPy is so easy, is there a reason why 2.4 (and more recent Numeric) binaries are not available? -- Matt -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iD8DBQFCPzQinLpDzL5I7l8RAo8CAJsGZ5M+aBUvnGnmavAL5GHIbSAhoACfXUbZ 9fOXLmC/2exQ1jzWZd3iO2A= =HPtD -----END PGP SIGNATURE-----

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Python 2.4 (Windows) Binaries of SciPy
by Srijit Kumar Bhadra 21 Mar '05

21 Mar '05

Hello, I am looking for Python 2.4 Binaries (Windows)of SciPy. Are there any plans to upload Python 2.4 binaries? With regards, Srijit Kumar Bhadra __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/

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Jacobian matrix
by Nils Wagner 21 Mar '05

21 Mar '05

Hi all, Is there a simpler way (built-in function) to compute the Jacobian of a vector function ? How about higher order derivatives of vector-valued functions ? from scipy import * def f(x): # tmp = zeros(5,Float) tmp[0] = x[0] + x[1] + x[2]**2 + x[3]**2 + x[4]**2 - 2 tmp[1] = x[0] - x[1] + x[2]**2 + x[3]**2 + x[4]**2 tmp[2] = -x[2]**2 + x[3]**2 + x[4]**2 tmp[3] = x[2]**2 - x[3]**2 + x[4]**2 tmp[4] = x[2]**2 + x[3]**2 - x[4]**2 return tmp x0 = array(([1.02,1.02,0.02,0.02,0.02])) eps = 1.e-5 J = zeros((5,5),Float) for i in arange(0,5): ei = zeros(5,Float) ei[i] = 1.0 J[:,i] = (f(x0+eps*ei)-f(x0))/eps Any pointer would be appreciated. Thanks in advance Nils

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Issues with scimath
by R. Padraic Springuel 19 Mar '05

19 Mar '05

Does any one else have problems with the scimath wrappers for arccos, arcsin, and arctanh? I'm running Python 2.3 on a Windows XP machine and every time I try to call those functions for an input that has a result in the complex range, python experiences a fatal error and is forced to close. This doesn't happen for any of the other functions in scimath and also doesn't happen when I import Numeric instead of scipy. Has anyone else experienced this problem or know how to fix it? -- R. Padraic Springuel

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Partial Derivatives
by R. Padraic Springuel 18 Mar '05

18 Mar '05

Well, after some figuring, I've come to the following conclusions. Scientific.Functions.Derivatives is only for analytic functions. If you have a numerical data set, you can't use it to get the derivative of the function that describes that data set at a given point unless you know what that function's analytical form. This means that it can be used in place of scipy.derivative, but not scipy.central_diff_weights. However, for its purpose it seems to work well. As written it works with most functions within Numeric. It doesn't currently have differentiation routines for arcsinh, arccosh, and arctanh, but adding those is fairly easy (and a fix I've already made). It also can't handle logn, log2, sec, csc, cot, arcsec, arccsc, arccot, sech, csch, coth, arcsech, arccsch, and arccoth but I think that's more because these functions are not defined by Numeric (likely because they all can be written in terms of functions which are defined fairly easily). I'm probably going to fix this at some point, I just have to figure out where to put the definitions of these additional functions since ufuncs (where the other basic mathematical functions are defined) is not editable. The biggest issue I have with the package is an issue it inherits from Numeric. For certain functions which have a limited domain for the real range space, you have to explicitly tell numeric that your allowing for the possibility of a complex answer by phrasing the input as a complex number with a 0 imaginary component (i.e. sqrt(-3) doesn't work but sqrt(-3+0j) does). In order for DerivVar to work in the part of the domain that uses the non-real range you have to pull the same trick. Now, the wrappers in scimath do quite nicely as a work around for this difficulty for normal functions, but they don't work for DerivVar class inputs. They weren't written with the DerivVar class in mind and raise a TypeError when you try to put a DerivVar into them (even in the "normal" domain for the function). I'm not quite sure how to fix this issue yet, but I'm looking into it. I'm pretty sure it'll involve a rewrite of _tocomplex in scimath, I'm just not sure how to do so yet. If anyone has any ideas or suggestions, let me know. I'll make sure I post my progress and will make the code available when its finished. -- R. Padraic Springuel

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[Scipy & Python 2.4] Naive question
by Razafindrakoto Jean Claude 18 Mar '05

18 Mar '05

Is there any release of Scipy working with Python 2.4 ? Thanks ______________________________________________________________ AXA CESSIONS Jean-Claude RAZAFINDRAKOTO Re-ARMS Reinsurance - Actuarial and Risk Management Services 109 rue La Boétie 75008 Paris Tel. : +33 1 56 43 78 54 Fax. : +33 1 56 43 78 70 E-mail : jeanclaude.razafindrakoto(a)axa-cessions.com <mailto:jeanclaude.razafindrakoto@axa-cessions.com> _______________________________________________________________

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Simple 2D animations?
by Petr Kucera 18 Mar '05

18 Mar '05

Hello Scipy users! I'm new here and actually I'm looking for a tool to plot simple 2D animations. I want for example do a simple 2D animation showing earth going around the sun. Another example is to plot x-y animation of lorenz attractor. I would like to have a point which will move with time and possible draw the trail. To give a better idea, here is a simple script: ============================ import Numeric t = 0 i = 0 while 1: t=i/100.0 x=Numeric.sin(t) y=Numeric.sin(t+0.5) print x, y i+=1 ============================ I would like to plot just last (x,y) point. I should get a simple animation, where the (x,y) will move in a graph. Is SciPy the right tool for me? Many thanks for any hint! Peter ____________________________________________________________ http://www.seznam.cz - e-mailová schránka 1000 MB

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Re: [SciPy-user] stats newbie question
by r help 17 Mar '05

17 Mar '05

hi it is version 0.3.2. however ive looked over the debian bug system and this error has been logged against the debian package python2.3-scipy. it has been closed; the problem is that the fix hasnt propagated down to my distribution yet, so this is not a problem with scipy but with the debian package. the fix is simply to comment out 'import pstats' in stats/__init__.py, which ive done and so far it seems to work. thanks anyway! -gong --- Travis Oliphant <oliphant(a)ee.byu.edu> wrote: > r help wrote: > > >here they are: > > > > > >Python 2.3.5 (#2, Feb 9 2005, 00:38:15) > >[GCC 3.3.5 (Debian 1:3.3.5-8)] on linux2 > >Type "help", "copyright", "credits" or "license" > for > >more information. > > > > > >>>>from scipy import * > >>>>stats.lognorm.cdf(1,1) > >>>> > >>>> > >Traceback (most recent call last): > > File "<stdin>", line 1, in ? > > File > >"/usr/lib/python2.3/site-packages/scipy_base/ppimport.py", > >line 303, in __getattr__ > > module = self._ppimport_importer() > > File > >"/usr/lib/python2.3/site-packages/scipy_base/ppimport.py", > >line 273, in _ppimport_importer > > module = __import__(name,None,None,['*']) > > File > >"/usr/lib/python2.3/site-packages/scipy/stats/__init__.py", > >line 7, in ? > > import pstats > >ImportError: No module named pstats > > > > > > > > > > > > > This looks like a package installation problem. > Could you tell us what version of scipy you are > running? > > type > > scipy.__version__ > > _______________________________________________ > SciPy-user mailing list > SciPy-user(a)scipy.net > http://www.scipy.net/mailman/listinfo/scipy-user > __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/

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Re: [SciPy-user] stats newbie question
by r help 17 Mar '05

17 Mar '05

hi > In [1]: from scipy import * > In [2]: stats.lognorm.cdf(1,1) > Out[2]: NumPy array, format: long > 0.5 thanks for the suggestion, here are the errors i get when i type in the suggestion. note that i installed scipy using a debian package; does this mean the problem lies in the debian scipy package? thanks for any further help -gong > What errors? here they are: Python 2.3.5 (#2, Feb 9 2005, 00:38:15) [GCC 3.3.5 (Debian 1:3.3.5-8)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from scipy import * >>> stats.lognorm.cdf(1,1) Traceback (most recent call last): File "<stdin>", line 1, in ? File "/usr/lib/python2.3/site-packages/scipy_base/ppimport.py", line 303, in __getattr__ module = self._ppimport_importer() File "/usr/lib/python2.3/site-packages/scipy_base/ppimport.py", line 273, in _ppimport_importer module = __import__(name,None,None,['*']) File "/usr/lib/python2.3/site-packages/scipy/stats/__init__.py", line 7, in ? import pstats ImportError: No module named pstats >>> __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo

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Re: Re: Partial Derivatives
by R. Padraic Springuel 17 Mar '05

17 Mar '05

What do you mean by non-standard functions? -- R. Padraic Springuel

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