Mailman 3 August 2001 - NumPy-Discussion

swig and Numeric
by Paul F. Dubois 08 Aug '01

08 Aug '01

Does someone have an example of using SWIG to connect Numeric arrays to C code that expects double* arguments?

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permutation and array subsets
by Serge Rey 08 Aug '01

08 Aug '01

i'm trying to use the results of permutation (from RandomArray.py) to reorder the rows of an array: >>> r=arange(20) >>> id=permutation(20) >>> y=r[id] Traceback (most recent call last): File "<stdin>", line 1, in ? IndexError: invalid index >>> i can use a for loop to permutate the ordering of r, but that has a speed hit associated with it. can anyone offer a suggestion for a way to do this more efficiently? thanks, serge -- Sergio J. Rey http://typhoon.sdsu.edu/rey.html

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swig and Numeric
by Paul F. Dubois 07 Aug '01

07 Aug '01

Does someone have an example of using SWIG to connect Numeric arrays to C= code that expects double* arguments?

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swig and Numeric
by Paul F. Dubois 07 Aug '01

07 Aug '01

Does someone have an example of using SWIG to connect Numeric arrays to C= code that expects double* arguments?

1 0

NumTut
by 이규봉 07 Aug '01

07 Aug '01

Dear who may be concerned, I want to install the package NumTut. But I can't find the directory of source distribution. Please let me know how to get the directory odf souce distribution and the subdirectory Demo. Thanks Gyoy-Bong Lee from Korea

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new to list
by Rob 03 Aug '01

03 Aug '01

Hello, I'm new to the list so I thought I'd introduce myself. I use Numpy at work for some Python programs that interface with Agilent and/or Anritsu microwave equipment, using the GPIB bus. However, my main interest lately is porting some EM codes into Numeric Python. I've had varied success. See my web site www.members.home.net/europax. Right now I'm trying to Numpy-ize this FEM-MOM code. I've profiled it using the Python profile class. Using MOM for a dipole takes 5 minutes of cpu :) :) Interestingly, some of the worst routines are simple ones that really have little to do with matrix math. Anyway, I'm having fun. Its wonderful to be able to focus on algorithms rather than wading through arcane programming syntax !! Rob.

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A savespace bug, perhaps?
by Nathaniel Gray 02 Aug '01

02 Aug '01

Hi everybody, I'm using Python 2.1.1 and Numpy 20.1.0 This seems to be a problem: Python 2.1.1 (#2, Jul 31 2001, 14:10:42) [GCC 2.96 20000731 (Linux-Mandrake 8.0 2.96-0.48mdk)] on linux2 Type "copyright", "credits" or "license" for more information. >>> from Numeric import * >>> from MLab import zeros >>> joe = zeros(3,'l',1) >>> fred = array([1,2,3],'l') >>> joe += fred Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: return array has incorrect type This fails whether or not fred has the spacesaver flag set. This, however, works fine: >>> joe = zeros(3, 'l') >>> fred = array([1,2,3], 'l') >>> joe += fred >>> joe array([1, 2, 3]) Am I doing something wrong or is this a bug? Please CC to me since I'm not subscribed to the list. Thanks a lot! -Nathan -- Nathaniel Gray California Institute of Technology Computation and Neural Systems --

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