Mailman 3 March 2001 - NumPy-Discussion

preventing coercion of matrix
by Mathew Yeates 13 Mar '01

13 Mar '01

Hi- I'm using Numpy with GL and came across the following problem. a=ones((2,2),'f') print a.itemsize() #result is 4 b=1.0*a print b.itemsize() #result is 8 1) I want to pass my array to a GL routine which can only handle floats also 2) I deal with large data sets and would prefer to keep my array of type float. Is there some to prevent the upcast? I realize Python only has double datatypes but still .... that shouldnt prevent me from have floats in my object. Any help? Mathew

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Announcing PyQwt-0.29.x: fast and easy data plotting with Python and NumPy
by Gerard Vermeulen 11 Mar '01

11 Mar '01

Hi all, I am announcing PyQwt-0.29.x: fast and easy data plotting with Python and NumPy see http://gerard.vermeulen.free.fr This is a set of Python bindings for the Qt-2.x and Qwt-0.3 (Qt Widgets for Technical Applications) C++ libraries. It allows you to create interactively 2D-plots of lists, tuples or NumPy arrays of Python floats (=C/C++ doubles). Gerard Vermeulen

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Riccati, Sylvester, Lyapunov matrix equations
by Nils Wagner 08 Mar '01

08 Mar '01

Hi, I am looking for Python (Numpy, MatPy) routines to solve matrix equations like Sylvester, Lyapunov and Riccati. Thanks in advance. Nils Wagner

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RE: Numpy array matching
by Paul F. Dubois 08 Mar '01

08 Mar '01

They are being held for an administrative reason, my administrator password won't work, and I haven't gotten the SourceForge people to fix it yet. I don't understand the administrative reason since I can't get in to see what it really is -- something about implicit destination, which is greek to me. I'm at Spam 9 and can't work on it. -----Original Message----- From: Sam Tannous [mailto:stannous@cisco.com] Sent: Wednesday, March 07, 2001 11:02 AM To: Paul F. Dubois Subject: Numpy array matching Hi Paul, My emails to numpy-discussion don't seem to make it. Is something wrong at sourceforge? Is it just me? Thanks, Sam -- Sam Tannous email: stannous(a)cisco.com ) Software Engineer phone: 919.392.2541 ( NSITE/SPLoB Tools pager: 800.365.4578 C[_] ----- Forwarded message from Sam Tannous <stannous(a)cisco.com> -----

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array matching
by Sam Tannous 08 Mar '01

08 Mar '01

If I have a character array t: >>> t = array(['abcd','aacd','ddfa','qqcd']) >>> print t [[a b c d] [a a c d] [d d f a] [q q c d]] What's the most efficient way to create an array that contains the indexes of the rows that match a particular pattern. If I want to match a 'c' in the third column, I'd like the array to look like this: i = array([0,1,3]) Thanks, Sam ----- End forwarded message -----

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array matching
by Sam Tannous 08 Mar '01

08 Mar '01

If I have a character array t: >>> t = array(['abcd','aacd','ddfa','qqcd']) >>> print t [[a b c d] [a a c d] [d d f a] [q q c d]] What's the most efficient way to create an array that contains the indexes of the rows that match a particular pattern. If I want to match a 'c' in the third column, I'd like the array to look like this: i = array([0,1,3]) Thanks, Sam ----- End forwarded message -----

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18.0 release for Windows
by Paul F. Dubois 05 Mar '01

05 Mar '01

I made my first attempt at a Windows release, Numerical-18.0.0-Python2.1.zip. Please note it only works with Python2.1b1. Comparisons returning array results are now available, thanks to Travis and his students. I do not have time to make a source release before Spam 9 so please use CVS if you need the sources for a Unix build with 2.1b1.

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numpy-17.3.0 build errors
by Matthias Klose 03 Mar '01

03 Mar '01

On i386-linux I am unable to build on a machine with no previous version of numpy installed. the arrayobject.h header cannot be found. Is there a way to actually show the commands use for compiling? The build procedure then continues to build the other modules and seems to ignore the return values from the compiler runs.

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array_getcharbuf()
by Jack Jansen 01 Mar '01

01 Mar '01

My compiler gives an error on array_getcharbuf() (in arrayobject.c), and on inspection it looks as though it is right. Array_getcharbuf() has a char **ptrptr argument, and it passes *ptrptr to array_getreadbuf(), which expects a void **. My guess is that it needs to pass ptrptr, not *ptrptr. And it definitely needs a cast... This is all from the repository sources, by the way. -- Jack Jansen | ++++ stop the execution of Mumia Abu-Jamal ++++ Jack.Jansen(a)oratrix.com | ++++ if you agree copy these lines to your sig ++++ www.oratrix.nl/~jack | ++++ see http://www.xs4all.nl/~tank/ ++++

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