Mailman 3 August 2006 - SciPy-User

SciPy 2006 LiveCD torrent is available
by Bryce Hendrix Aug. 10, 2006

Aug. 10, 2006

For those not able to make SciPy 2006 next week, or who would like to download the ISO a few days early, its available at http://code.enthought.com/downloads/scipy2006-i386.iso.torrent. We squashed a lot onto the CD, so I also had to trim > 100 MB of packages that ship with the standard Ubuntu CD. Here's what I was able to add: * SciPy build from svn (Wed, 12:00 CST) * NumPy built from svn (Wed, 12:00 CST) * Matplotlib built from svn (Wed, 12:00 CST) * IPython built from svn (Wed, 12:00 CST) * Enthought built from svn (Wed, 16:00 CST) * ctypes 1.0.0 * hdf5 1.6.5 * networkx 0.31 * Pyrex 0.9.4.1 * pytables 1.3.2 All of the svn checkouts are zipped in /src, if you'd like to build from a svn version newer than what was shipped, simple copy the compressed package to your home dir, uncompress it, run "svn upate", and built it. Please note: This ISO was built rather hastily, uses un-official code, and received very little testing. Please don't even consider using this in a production environment. Bryce

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sorry (mailing list is a bit slow?)
by David Grant Aug. 10, 2006

Aug. 10, 2006

Sorry for the re-send everybody (and for this message). It looks like my first email and the re-send hit the archives already but I have yet to receive either of them through the mailing list. Did anyone receive either of those messages? Please reply in private, do not reply to the list. Thanks and sorry again. -- David Grant

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Re: [SciPy-user] hough transform
by stephen emslie Aug. 9, 2006

Aug. 9, 2006

On 8/4/06, Stefan van der Walt <stefan(a)sun.ac.za> wrote: > This example is optimised for straight lines. For a generalised > transform, one would probably have to do a search through the full > parameter space. Then the 'for'-loops might kill performance. I > guess the best would be to try and find an article that has an > algorithm for the specific case you are interested in. I've been giving this some thought and reading more about the hough transform. I'm new to image processing but I think I'm getting a better understanding of how it works. How about including a hough transform function in scipy? It seems like a useful function to have in the image processing toolbox, and the line detection seems fairly straightforward. Stefan's implementation already looks like a great start. Is this something that would be useful for others? (Stefan - sorry for the double mail) Stephen

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Use of Scipy in a students final year mechanical engineering project.
by Stephen Kelly Aug. 9, 2006

Aug. 9, 2006

Hi, I sent this email to Eric Jones, but he recommended that I send it to this mailing list instead. I'm trying to see if scipy could fit into a final year project for my mechanical engineering course. I am a student of mechanical engineering in UCD Dublin , and part of my course involves doing a final year project. We do very little programming in my course, but as coding and python in particular is something that interests me, I'd like to have some involvement in python in my final year project. Because my course is not centered around coding, I think I'd be more likely to be able to do a project on applying a python application like scipy to a problem, or using python as glue in a scripting applicatin. I found scipy while searching for an idea for a project that I could do in python, while staying within the scope of mechanical engineering and my course. I'm still no closer to an idea, so I thought I'd write to you to see if you had any ideas of what I might be able to do as a mechanical engineer with python/scipy. Something that I think might be plausible might be a simulation or computational analysis of some kind, but I would probably need to justify using python for whatever I do rather than MatLab, which is the industry standard, and the program that my lecturers are already familiar with. I have never used MatLab myself, so I'm not sure what it offers. I would appreciate any thoughts you might have on this. I emailed one of my lecturers already, who asked me for more specific details and to give thought to the type of project I would like to do. Kind Regards, Stephen Kelly

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weave: doesn't know about scalar type 'float32scalar'
by Sebastian Haase Aug. 9, 2006

Aug. 9, 2006

Hi! I get this error File "../lib/python/scipy/weave/inline_tools.py", line 366, in attempt_function_call raise TypeError, msg TypeError: cannot convert value to double and I think it's referring to this variable: (Pdb) p type(ssubSqSum) <type 'float32scalar'> Should weave treat this like a regular float !? Thanks, Sebastian Haase

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Building on Windows with the Intel Visual Fortran Compiler
by Albert Strasheim Aug. 9, 2006

Aug. 9, 2006

Hello all I'm trying to compile SciPy from SVN with MSVC and the Intel Visual Fortran Compiler, version 9.1. In the root of the SciPy source tree I have my site.cfg which contains: [blas_src] src_dirs = C:\home\albert\work2\blas [lapack_src] src_dirs = C:\home\albert\work2\lapack Inside the "Build Environment for Fortran IA-32 applications" command prompt I run the following command: python setup.py config --compiler=msvc --fcompiler=intelv build --compiler=msvc bdist_wininst (the build part doesn't seem to accept a --fcompiler option). This runs for a while and then it prints: Fortran f77 compiler: f77 -g -Wall -fno-second-underscore -mno-cygwin /w /I:C:\Program Files\VNI\CTT6.0\include\IA32 /fpe:3 /nologo -O2 -funroll-loops -fomit-frame-pointer -malign-double Fortran f90 compiler: ifort /w /I:C:\Program Files\VNI\CTT6.0\include\IA32 /fpe:3 /nologo /w /I:C:\Program Files\VNI\CTT6.0\include\IA32 /fpe:3 /nologo -O2 -funroll-loops -fomit-frame-pointer -malign-double Fortran fix compiler: ifort /w /I:C:\Program Files\VNI\CTT6.0\include\IA32 /fpe:3 /nologo /w /I:C:\Program Files\VNI\CTT6.0\include\IA32 /fpe:3 /nologo -O2 -funroll-loops -fomit-frame-pointer -malign-double followed by creating build\temp.win32-2.4 creating build\temp.win32-2.4\Lib creating build\temp.win32-2.4\Lib\fftpack creating build\temp.win32-2.4\Lib\fftpack\dfftpack compile options: '-c' f77:f77: Lib\fftpack\dfftpack\dcosqb.f Could not locate executable f77 Executable f77 does not exist which obviously isn't going to work, since I'm not using the MinGW compiler, nor did I specify it anywhere. The IntelVisualFCompiler class in intel.py in numpy.distutils contains: fc_exe = 'ifl' ... executables = { ... 'compiler_f77' : [fc_exe,"-FI","-w90","-w95"], 'compiler_fix' : [fc_exe,"-FI","-4L72","-w"], 'compiler_f90' : [fc_exe], ... } which looks like it should work, but it doesn't. Any ideas? Regards, Albert

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weave: how to give code to someone w/o compiler
by Sebastian Haase Aug. 8, 2006

Aug. 8, 2006

Hi, I just starting to use weave - it seems to be the best thing since sliced bread ... First I have two questions: a) Is it possible to distribute modules using weave to other people who might NOT have a C compiler installed ? b) when I (or someone who does not have a C compiler !) change parts of that module that should not require a recompiling of the C part - is weave smart enough to recognise this ? Thanks, Sebastian Haase

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weave: how to return values
by Sebastian Haase Aug. 8, 2006

Aug. 8, 2006

Hi, I am surprised when reading this example in the documentation: >>> a = 1 >>> a = weave.inline("return_val = Py::new_reference_to(Py::Int(a+1));",['a']) >>> a 2 is it really true that I can not just write !? a = weave.inline("return_val = a+1;",['a']) I was under the impression that basic types were handled transparently; how about: a = weave.inline("char s[100] = "test"; return_val = s;") Thanks, Sebastian Haase

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Install problem
by Samuel GARCIA Aug. 8, 2006

Aug. 8, 2006

Hi all, from the latest svn version of numpy (2975) and scipy(2151) I have this problem for scipy (numpy is OK) : Traceback (most recent call last): File "setup.py", line 55, in ? setup_package() File "setup.py", line 47, in setup_package configuration=configuration ) File "/usr/local/lib/python2.3/site-packages/numpy/distutils/core.py", line 144, in setup config = configuration() File "setup.py", line 19, in configuration config.add_subpackage('Lib') File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 753, in add_subpackage caller_level = 2) File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 736, in get_subpackage caller_level = caller_level + 1) File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 683, in _get_configuration_from_setup_py config = setup_module.configuration(*args) File "./Lib/setup.py", line 22, in configuration config.add_subpackage('ndimage') File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 753, in add_subpackage caller_level = 2) File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 736, in get_subpackage caller_level = caller_level + 1) File "/usr/local/lib/python2.3/site-packages/numpy/distutils/misc_util.py", line 668, in _get_configuration_from_setup_py ('.py', 'U', 1)) File "Lib/ndimage/setup.py", line 3, in ? from numpy.numarray import get_numarray_include_dirs File "/usr/local/lib/python2.3/site-packages/numpy/numarray/__init__.py", line 3, in ? from functions import * AttributeError: 'module' object has no attribute 'concatenate' Any idea Thanks a lot Samuel

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symbolic math & scipy (& maxima)...
by fredantispam＠free.fr Aug. 8, 2006

Aug. 8, 2006

Hi, I need to find out the (first) derivative of associated Legendre polynomials defined in lpmn(m,n,x). The problem is that I want to derive vs theta where x=cos(theta). For instance, for m=1 & n=0, P_0^1(cos(theta)) = cos(theta) -> P_0^1'(cos(theta)) = -sin(theta) I know that scipy has not symbolic math module (and pythonica seems to be quite old & unmaintained). But I use maxima. So I wonder if it would be possible to run maxima, derive assoc_legendre_p(n,m,cos(theta)) vs. theta and "send" the result to python. How could I do that ? Cheers,

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