Mailman 3 February 2007 - SciPy-User

Hilbert-Huang?
by Gary Strangman 12 Feb '07

12 Feb '07

Hi all, Does anyone know of (or have) a python implementation of the Hilbert-Huang transform out there somewhere? Numpy, Numeric, numarray, scipy, doesn't matter to me. 'fraid my searches have come up empty ... -best Gary

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Doesn't Scipy have the Fermi-Dirac distribution?
by Hui Chang Moon 11 Feb '07

11 Feb '07

I am a graduate school student. Nowadays I'm writing a semiconductor simulation code with numpy and scipy. In my field, the Fermi-Dirac distribution function is frequently used. I hope to know if the scipy has the Fermi-Dirac distribution function or not. Have a nice day~! ^o^

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scipy print using ipython
by Emmanuel Pecontal 10 Feb '07

10 Feb '07

Hello, I am using the fmin_l_bfgs_b function in scipy. This function has a parameter for controling the iteration printing during the minimization. In fact the printing is done by the fortran routine via a command like: write (6,1002) iter,f,sbgnrm which is a print on the screen. For some reason I don't understand, when I use the routine in ipython, the print is done only by bunch of lines every few minutes... just like if it was bufferized before printing. Does someone knows the reason of this beheviour? is it a python, ipython or scipy problem? Cheers Emmanuel -- Emmanuel Pécontal CRAL - Observatoire de Lyon 9, Av. Charles Andre F-69561 Saint Genis Laval Cedex tel (33) (0)4.78.86.83.76 - fax (33) (0)4.78.86.83.86 email : pecontal(a)obs.univ-lyon1.fr ~

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Hints for easy install of scipy on RHEL 4?
by Russell E. Owen 10 Feb '07

10 Feb '07

We installed scipy on RHEL 4 using the "built in" blas/lapack. Much of it works but some components that we need fail, apparently because RedHat's blas/lapack is incomplete. So...can anyone point me to an existing RPM of a complete blas/lapack (or a complete Atlas) that we can just use? Google showed lots of RPMs but they didn't appear to be for RedHat Enterprise Linux and I'm not unix-savvy enough to know what alternatives we can get away with. -- Russell

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Error on trying to install SciPy
by Brad Malone 09 Feb '07

09 Feb '07

Hi everyone, sorry to be a bother but I'm getting really frustrated with trying to install SciPy. When I build or install this is what it tells me before it exits. Anyone have a clue why this would be? I REALLY appreciate any help. IPO link: can not find "(" ifort: error: problem during multi-file optimization compilation (code 1) error: Command "/auto/opt/intel/fc/9.0/bin/ifort -shared -nofor_main -tpp6 -xM -arch SSE build/temp.linux-i686-2.4/build/src.linux-i686-2.4 /Lib/fftpack/_fftpackmodule.o build/temp.linux-i686-2.4/Lib/fftpack/src/zfft.o build/temp.linux-i686-2.4/Lib/fftpack/src/drfft.o build/temp.linux-i686-2.4/Lib/fftpack/src/zrfft.o build/temp.linux-i686-2.4/Lib/fftpack/src/zfftnd.o build/temp.linux-i686-2.4/build/src.linux-i686-2.4/fortranobject.o -L/opt/lib -Lbuild/temp.linux-i686-2.4 -ldfftpack -lrfftw -lfftw -o build/lib.linux-i686-2.4/scipy/fftpack/_fftpack.so" failed with exit status 1 Best, Brad

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new behaviour of c_[] in scipy 0.5.2
by James Battat 09 Feb '07

09 Feb '07

Hi, In the past: (scipy 0.4.8, numpy 0.9.6) >>> print scipy.c_[1,2,3] [1,2,3] but now: (scipy 0.5.2, numpy 1.0.1) >>> print scipy.c_[1,2,3] [[1,2,3]] A nested array! This breaks my old code because: >>> array = scipy.c_[1,2,3] >>> print array[1] IndexError: index is out of bounds Is the current behaviour expected? Thanks for your help, James ************************** Harvard University Dept. of Astronomy 60 Garden Street MS-10 Cambridge, MA 02138 phone 617.496.0742 lab 617.495.3267 email jbattat(a)cfa.harvard.edu **************************

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Vectorization question
by Anand Patil 09 Feb '07

09 Feb '07

Hi all, I want to make array A from array B like so: A[t, j, k] = \sum_i B[t, j, i] B[t, i, k] That is, for each t A[t,] = dot(B[t,], B[t,]) There's no loopless way to do this in numpy, right? Thanks much, Anand

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parallel usage of fftw
by Glen W. Mabey 09 Feb '07

09 Feb '07

Hello, I've read at http://www.fftw.org/fftw3_doc/Usage-of-Multi_002dthreaded-FFTW.html#Usage-o… that getting fftw to use multiple threads to speed up performance on SMP machines is quite easy to initiate. Has anyone used tried this? I haven't ever used fftw without scipy, but if there were some way to easily implement a python interface such that fftw_init_threads(), fftw_plan_with_nthreads(), and fftw_cleanup_threads() could be called, it would be really cool. I'm having a bit of a time trying to figure out how fftpack is married to fftw ... maybe I should just try calling those functions with ctypes? Any input would be greatly appreciated. Thanks, Glen

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QME-Dev wxSciPY workbench 0.0.9.24 released - updated and corrected for Python 2.4
by Robert VERGNES 08 Feb '07

08 Feb '07

Version Alpha 0.0.9.2.4 updated today. New ZIP file for download. Correction made to the plotting/Graph issue with Python 2.4 + Example files added for review of workbench. https://sourceforge.net/project/showfiles.php?group_id=181979 Note: wxPython 2.8 is still necessary to run the wrokbench. --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.

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Windows binary 0.5.2 requires SSE2
by Jonathan Griffitts 08 Feb '07

08 Feb '07

Hi! I have installed SciPy 0.5.2 for Python 2.5 on several Windows computers, using the precompiled binary scipy-0.5.2.win32-py2.5.exe. This works fine on some, but on others it crashes Python with an Illegal Instruction exception. The crash is easy to find by running the test() suite or by attempting to make any use of scipy.integrate.quad. Digging into it, I see that the exception comes from _quadpack.pyd, and it dies at a MOVSD instruction. I believe MOVSD is an SSE2 instruction that is only implemented on the more recent CPUs from both Intel and AMD. Has anyone out there compiled win32 binaries for Python 2.5 and older CPUs without SSE2? If so, could I beg for a copy? If not, I'll dig into getting set up to compile SciPy myself. Thanks, -- Jonathan Griffitts AnyWare Engineering Boulder, CO, USA

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