Mailman 3 December 2001 - NumPy-Discussion

Numeric 21.0a1 in CVS
by Paul F. Dubois Dec. 27, 2001

Dec. 27, 2001

Version 21.0a1 -- in CVS only Please help me test the following. I have tested on Windows / Python 2.2. Implement true division operations for Python 2.2 (Bruce Sherwood, our hero). New functions in Numeric; they work on any sequence a that can be converted to a Numeric array. def rank (a): "Get the rank of a (the number of dimensions, not a matrix rank)" def shape (a): "Get the shape of a" def size (a, axis=None): "Get the number … [View More]

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trouble ingegrating Numpy arrays into a class statement
by Rob Dec. 24, 2001

Dec. 24, 2001

I have this Class: class Cond: x1=0 y1=0 z1=0 x2=0 y2=0 z2=0 DelX=0 DelY=0 DelZ=0 What I want is for Cond to be a Numpy array of 20 values, each with the above members. Thus I could say in a statement: wire=Cond a= wire[10].x1 b= wire[5].z2 etc... How can I go about this? Thanks, Rob. and Merry Christmas!!!!!!! ps. this is for an FEM-MOM grid generator -- The Numeric Python EM Project www.pythonemproject.com

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my Numpy statements are slower than indexed formulations in some cases
by Rob Dec. 23, 2001

Dec. 23, 2001

I have a number of thse routines in some EM code. I've tried to Numpyize them, but end up with code that runs even slower. Here is the old indexed routing: ----------------- for JJ in range(0,TotExtMetalEdgeNum): McVector+=Ccc[0:TotExtMetalEdgeNum,JJ] * VcVector[JJ] ---------------- Here is the Numpy version: --------------------- McVector= add.reduce(transpose(Ccc[...] * VcVector[...])) --------------------- I wonder if there is another faster way to do this? Thanks, Rob. -- … [View More]

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next step for numarray
by Perry Greenfield Dec. 20, 2001

Dec. 20, 2001

I just thought I would write a few words about what will be happening with numarray development. At the moment it is quiescent since we have another internal project to finish. Hopefully that will be done in 3 weeks or so; we will start work on numarray again. I've gotten feedback from Guido regarding the safety issue; he made it clear that we should not be able to let the user crash Python, even if they can do that only by bypassing the public interface. Since there may be implications for the … [View More]

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float** arrays and Numarray
by Edward C. Jones Dec. 20, 2001

Dec. 20, 2001

I use Numeric to transfer images between various image processing systems. Numarray includes most of the image data memory layouts that I have seen except for: Some C types need to be added (as several people have already commented). Some systems define an array as a "pointer to an array of pointers to ...". "Numerical Recipes in C" explains this approach clearly. Could this perhaps be implemented in Numarray as a buffer interface with multiple data segments? Thanks, Ed Jones

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converting IDL to python
by Mark Fardal Dec. 20, 2001

Dec. 20, 2001

Hi, earlier this month Joe Harrington posted this: NASA's immediate objective will be a complete data-analysis system to replace IDL, in short order, including an IDL-to-python converter program. That shouldn't be hard as IDL is a simple language, and PyDL may have solved much of that problem. I'm an IDL user, and I'm currently trying to see if I can switch over to python. It strikes me that an IDL-to-python converter program is a VERY ambitious idea. While IDL's syntax is rather … [View More]

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converting IDL to python
by jmr＠engineering.uiowa.edu Dec. 20, 2001

Dec. 20, 2001

Rick White writes: > The hardest part (as you mention) is that IDL has a really large > collection of built-in functions which probably will not be readily > available in Python. Until someone writes things like the morphological > dilation and erosion operations, it won't be possible to translate IDL > programs that use them. By the way, I do have binary erosion and dilation, along with connected components analysis, flood fill region grow, and several other common 2D/3D … [View More]

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Windows / 2.2 version up
by Paul F. Dubois Dec. 18, 2001

Dec. 18, 2001

I built the Windows installers for Python-2.2 and they should appear at sourceforge shortly.

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Python 2.2
by Ray Drew Dec. 18, 2001

Dec. 18, 2001

Does anyone know when a release for Python 2.2 on Windows will be available? regards, Ray Drew _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com

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pygsl source moved to sourceforge
by Achim Gaedke Dec. 14, 2001

Dec. 14, 2001

Hi! I've checked in my source, so it is available at http://pygsl.sourceforge.net/ . A mailinglist for discussion needs and support is created, please mail to: mailto:pygsl-discuss@lists.sourceforge.net . pygsl provides now: module pygsl.sf: with 200 special functions module pygsl.const: with 23 often used mathematical constants module pygsl.ieee: access to the ieee-arithmetics layer of gsl module pygsl.rng: provides several random number generators and different probability densities It … [View More]

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