Mailman 3 July 2005 - SciPy-User

Help required regding Eigenvectors
by Sudheer Phani 14 Mar '22

14 Mar '22

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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Python number handling?
by Howey, David A 09 Aug '05

09 Aug '05

I'm new to python... Why, why oh why did someone decide to make python do this: Integer case In [5]: 107 / 4 Out[5]: 26 Float case In [6]: 107.0 / 4 Out[6]: 26.75 I'm a bit worried that when it come to using variables, because you don't declare them (eg as integer or float) python might mess up division and give you the first result above rather than the second. Has anyone had any problems with this? Dave

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Re: [SciPy-user] PSP python (was crashing python)
by Victor Reijs 01 Aug '05

01 Aug '05

Hello Robert, Sorry, I think I should have stopped and restarted PSP8. So now I get the following output after resatrting PSP8: "Executing RunScript ['C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\DLLs', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\lib-tk', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\site-packages', 'c:\\python22\\lib\\site-packages'] [1.3, 0.69999999999999996, 0.80000000000000004, 1.8999999999999999, 1.2] Unknown error occurred with command: RunScript Executing RunScript ImportError: No module named _numpy Executing RunScript ['C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\DLLs', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\lib-tk', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\site-packages', 'c:\\python22\\lib\\site-packages'] [1.3, 0.69999999999999996, 0.80000000000000004, 1.8999999999999999, 1.2] [1.3, 0.69999999999999996, 0.80000000000000004, 1.8999999999999999, 1.2] Traceback (most recent call last): File "C:\Documents and Settings\vreijs\My Documents\My PSP8 Files\Scripts-Trusted\pickcolorb.PspScript", line 23, in ? from scipy.optimize import fmin File "C:\Python22\Lib\site-packages\scipy\optimize\__init__.py", line 7, in ? from optimize import * File "C:\Python22\Lib\site-packages\scipy\optimize\optimize.py", line 56, in ? import Numeric ImportError: No module named Numeric Executing RunScript ['C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\DLLs', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\lib-tk', 'C:\\Program Files\\Jasc Software Inc\\Paint Shop Pro 8\\Python Libraries\\lib\\site-packages', 'c:\\python22\\lib\\site-packages'] [1.3, 0.69999999999999996, 0.80000000000000004, 1.8999999999999999, 1.2] [1.3, 0.69999999999999996, 0.80000000000000004, 1.8999999999999999, 1.2] Traceback (most recent call last): File "C:\Documents and Settings\vreijs\My Documents\My PSP8 Files\Scripts-Trusted\pickcolorb.PspScript", line 23, in ? from scipy.optimize import fmin ImportError: cannot import name fmin" <there is now no duplication of my path any more, so that problem is solved, but I still have the issues with Numeric, _numpy, fmin, etc.> All the best, Victor > my script is now: > #==== > import sitecustomize > x0 = [1.3, 0.7, 0.8, 1.9, 1.2] > import sys > #sys.path.append("c:/python22/lib/site-packages") > print sys.path > print x0 > from scipy import * > print x0 > from scipy.optimize import fmin > print x0 > #====

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Re: [SciPy-user] 'crashing' python
by Brandon DuRette 31 Jul '05

31 Jul '05

Hi Victor, > That looks to be working and I can repeat it, which is good;-) > But why is this 'from scipy.optimize import fmin' needed even if I did > 'from scipy import *' before that? > If I read in the scipy documentation, I thought, that 'from scipy > import *' would be enough. I think your confusion is probably with the word 'package'. The code 'from scipy import *' imports everything from the 'scipy' package. But that's not 'all of scipy'. Scipy has subpackages, such as optimize, that are not imported as part of the main scipy package. For more on Python packages, check here: http://www.python.org/doc/current/tut/node8.html#SECTION0084000000000000000… > Just to let you know, I am a novice to python, so perhaps I > misunderstand the basics of it! No worries. We were all novices at one point. ;-) > I just am learning it because it is needed to do scripting in Paint > Shop Pro (PSP). PSP8 has Python 2.2 in it, but not the optimization > function fmin (which I need for optimizing colors in pictures: > http://www.iol.ie/~geniet/eng/IFRAOcoloropt.htm ) > >> * Does sys.path refer to the correct path (i.e., where you installed >> Enthon)? > > > I can't run the python code from the normal python GUI (IDLE). I get > this: > ">>> ================================ RESTART > ================================ > >>> > > Traceback (most recent call last): > File "C:\Documents and Settings\vreijs\My Documents\My PSP8 > Files\Scripts-Trusted\scipy.py", line 1, in -toplevel- > from scipy import * > File "C:\Documents and Settings\vreijs\My Documents\My PSP8 > Files\Scripts-Trusted\scipy.py", line 2, in -toplevel- > from scipy.optimize import fmin > ImportError: No module named optimize > >>> " Ah... I think I know what the problem is. Rename scipy.py to something else. By naming it scipy.py, you have shadowed the scipy package (and also the scipy.optimize subpackage). > Aoso 'print sys.path' gives no results: > ">>> print sys.path > > Traceback (most recent call last): > File "<pyshell#0>", line 1, in -toplevel- > print sys.path > NameError: name 'sys' is not defined > >>> " Yeah. I forgot to mention, you need to import sys first. 'import sys; print sys.path'. But that may be irrelevant at this point. Cheers, Brandon

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Error message I don't understand
by Christian Meesters 31 Jul '05

31 Jul '05

Hi I get this weird Traceback from my script: Traceback (most recent call last): File "FP.py", line 111, in ? main() File "FP.py", line 67, in main fitter(OD,ml) File "FP.py", line 98, in fitter tck = interpolate.splrep(ml,OD) File "/platlib/scipy/interpolate/fitpack.py", line 339, in splrep SystemError: error return without exception set The "fitter"-function so far contains only this line which causes the error. 'OD' and 'ml' are array objects. Running the example code from the tutorial does not result in any error. (And looking into fitpack.py didn't help.) Has anybody seen this error before and knows how to solve the problem? It's probably something really stupid, but I failed finding the solution. TIA Regards, Christian

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'crashing' python
by Victor Reijs 30 Jul '05

30 Jul '05

Hello all of you, I am trying to use scipy but I get some crashes. So here is the behavior: . I have now python 2.2.2 and 2.3.5 on my system . my system is a Dell Latitude D400, using WIndows XP, version 2002, SP2. Intel Pentium M . I installed SciPy-0.3.2.win32-py2.3-num23.5.exe and Win32 SciPy-0.3.2.win32-py2.2-num22.0.exe (I don't know what the P4SSE2 and PIII mean for my system, so U down loaded the generic ones). . When I do 'from scipy import *' in python 2.2.2 The application crashes and I get the "pythonw.exe has encountered a problem and needs to close. We are sorry for the inconvenience." window (and it wants to send things to microsoft). After this the python window is gone. . When I do 'from scipy import *' in python 2.3.5 The application crashes and I get the "pythonw.exe has encountered a problem and needs to close. We are sorry for the inconvenience." window (and it wants to send things to microsoft). In this case the python window does not close but it restarts: ">>> from scipy import * >>> ================================ RESTART ================================ >>>" What do I do wrong? Thanks for your feedback. All the best, Victor

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Numerical gradient approximation on matrix
by Dimitri D'Or 29 Jul '05

29 Jul '05

Hi all, I have a two-dimensional array from which I wish to compute the gradient (i.e. the slope against the first and second dimension). With Matlab, I can do it easily using the gradient.m function. Is there something similar in Scipy or matplotlib? I've browsed the documentation but couldn't found anything but approximate gradient computations on functions in the optimize module. Nothing about computations on matrices. Thank you for your help, Dimitri

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where can I get latest source?
by samar khatiwala 29 Jul '05

29 Jul '05

Hello I would like to acquire the most recent source code to compile on darwin (OS 10.3). The source from: http://www.scipy.org/download/ does NOT compile on my machine, and looking at past postings on the mailing list and the error messages I get, the solution seems to be to get a more recent version from the CVS repository. But the CVS server has been down for several days and no one has replied to my posting regarding that. Can anyone suggest alternate places to download the code from. Or better yet, perhaps some kind soul has a recent CVS snapshot and can stage it for me to download. Thanks very much Samar

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Ipython "run"
by Howey, David A 29 Jul '05

29 Jul '05

Perhaps someone could share their experience using the magic command %run in Ipython? I'm just testing it out, and unfortunately it doesn't seem to do a full reload of all imported modules etc. IDLE's <F5>, on the other hand, does. This is annoying! Any tips? Dave -----Original Message----- From: scipy-user-bounces(a)scipy.net [mailto:scipy-user-bounces@scipy.net] On Behalf Of Fernando Perez Sent: 13 July 2005 17:42 To: SciPy Users List Subject: Re: [SciPy-user] wxpython Howey, David A wrote: > yeah, I've got it running in colour.. I just meant the 'inline' colour > changes as you type > > also, what editor do you use with ipython? I quite liked the idle > built in editor You can use any editor you want, as ipython has very poor editing capabilities (limited to single-line changes). Some users like to call %edit with ipython, which will invoke your $EDITOR, try %edit? for more info. I personally don't like %edit, and my normal modus operandi is to run Xemacs with my files open, along with an ipython session where I use '%run foo' over and over as I modify the file foo.py. I find this to be a good balance: I get a good editor for the heavy lifting, and in the interactive ipython session I get good tracebacks, %pdb debugging, the ability to inspect objects resulting from my runs, and no expensive reinitialization of the interpreter for each test (this can be a HUGE deal if you are using complex/large libraries like scipy or VTK). Cheers, f _______________________________________________ SciPy-user mailing list SciPy-user(a)scipy.net http://www.scipy.net/mailman/listinfo/scipy-user

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ANN: SciPy 2005 Conf: Abstracts and early registration due 7/29/05
by Janet M. Swisher 28 Jul '05

28 Jul '05

Friday, July 29, 2005 is the deadline for abstract submission for the 2005 Scientific Computing in Python Conference, scheduled for September 22 and 23, at Caltech. More information on the conference, including abstract guidelines, can be found at <http://www.scipy.org/wikis/scipy05> The 29th is also the deadline for early registration for the conference. The early registration fee is US$100; regular registration is US$150. The conference fee includes breakfast and lunch both days, and dinner on the first day. -- Janet Swisher --- Senior Technical Writer Enthought, Inc. http://www.enthought.com

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