Mailman 3 October 2002 - SciPy-User

Debian package(s)?
by Kyler Laird Nov. 16, 2002

Nov. 16, 2002

Will SciPy be a Debian package soon? I'd like to have some people start using it. Thank you. --kyler P.S. Searching for anything (including "debian") on the SciPy pages yields "hits" of what appears to be all (378) pages.

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Possible bug in linalg.pin2
by Nils Wagner Oct. 31, 2002

Oct. 31, 2002

Hi, I wonder, why I can use only pinv. When I use pinv2 to compute the pseudo-inverse of Z I get the following message Z [[ 3.21699578 1.47577916 -3.05873705] [-1.54994823 3.24940826 2.79976045] [-4.241916 -2.41995866 -1.40655762] [ 2.81641276 -3.34681092 2.10674418] [-0.15888331 0.24404542 -0.20391515]] Pseudo-inverse of Z using lstsq [[ 0.07522953 -0.03500246 -0.11248811 0.08017751 -0.00476346] [ 0.05183121 0.10614625 -0.07713549 -0.11648354 0.00853543] [-0.12411384 0.11106407 -0.06726151 0.10105305 -0.00939367]] Pseudo-inverse of Z using svd Traceback (most recent call last): File "huadai.py", line 101, in ? h4 = linalg.pinv2(Z) File "/usr/local/lib/python2.1/site-packages/scipy/linalg/basic.py", line 327, in pinv2 return dot(tran(conj(vh)),tran(conj(u))*s[:,NewAxis]) ValueError: frames are not aligned Any suggestion ? Nils

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linalg.eig
by Nils Wagner Oct. 31, 2002

Oct. 31, 2002

Hi, How do I sort the eigenvalues and corresponding eigenvectors of w,vr = linalg.eig(A,B) in increasing order. It is assumed that all eigenvalues are real. Nils

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Open source in the lab
by William Ryu Oct. 28, 2002

Oct. 28, 2002

Scipy is briefly mentioned in Cameron Laird's article, "Open Source in the Lab." http://www-106.ibm.com/developerworks/library/l-oslab/?n-l-10242 -w

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sort complex numbers
by Nils Wagner Oct. 28, 2002

Oct. 28, 2002

Hi, How can I emulate Matlab's sort function for complex numbers in scipy ? Nils BTW, this is Matlab's policy. When X is complex, the elements are sorted by ABS(X). Complex matches are further sorted by ANGLE(X).

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Way to get values which are the same on two arrays
by José Luis Gómez Dans Oct. 28, 2002

Oct. 28, 2002

Hi, I seem to remember a Numerical function that could produce the list of values (or array positions) which are common to two arrays. In other words: a1=[1,2,3,9,10] a2=[1,4,9,10] result is [1,9,10]. Browsing through the Numerical docs doesn't refresh my memory, so any kind souls? many thanks, José -- José L Gómez Dans PhD student Tel: +44 114 222 5582 Radar & Communications Group FAX; +44 870 132 2990 Department of Electronic Engineering University of Sheffield UK

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zlib
by Nils Wagner Oct. 23, 2002

Oct. 23, 2002

Hi, Python must be build with zlib module enabled. How can I check that ? Nils

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SuSE specific recommendations svdvals
by Nils Wagner Oct. 23, 2002

Oct. 23, 2002

Hi Pearu, Thank you very much for all your useful hints. I have build both my own lapack library and ATLAS from scratch. However I cannot say exactly where the bug concerning svdvals was located, but now svdvals works fine ! Altogether I suggest to rebuild LAPACK in SuSE distributions. Regards, Nils

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LAPACK from Netlib
by Nils Wagner Oct. 23, 2002

Oct. 23, 2002

Hi Pearu, Please can you give some advice concerning the installation of the gzipped LAPACK tarball http://www.netlib.org/lapack/lapack.tgz I guess it's not so convenient in comparison with the ATLAS installation. Thanks in advance Nils

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svdvals
by Nils Wagner Oct. 22, 2002

Oct. 22, 2002

Hi Pearu, Did you find anything explaining the strange behaviour of svdvals ? BTW, python -c 'import atlas_version' gives ATLAS version 3.4.1 built by root on Die Jun 18 23:19:16 CEST 2002: UNAME : Linux linux 2.4.18-4GB #1 Wed Mar 27 13:57:05 UTC 2002 i686 unknown INSTFLG : MMDEF : /home/nwagner/ATLAS/CONFIG/ARCHS/ATHLON/gcc/gemm ARCHDEF : /home/nwagner/ATLAS/CONFIG/ARCHS/ATHLON/gcc/misc F2CDEFS : -DAdd__ -DStringSunStyle CACHEEDGE: 131072 F77 : /usr/bin/g77, version GNU Fortran 0.5.25 20010315 (release) F77FLAGS : -O CC : /usr/bin/gcc, version 2.95.3 CC FLAGS : -fomit-frame-pointer -O3 -funroll-all-loops MCC : /usr/bin/gcc, version 2.95.3 MCCFLAGS : -fomit-frame-pointer -O Nils

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