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From: Tim Churches <tchur@op...>  20020429 20:42:59

Jasper Phillips wrote: > > I'm helping my wife with programming for her economics thesis, which needs > to calculate a "Multiple Linear Regression" on her data. > > Does anyone know of any (preferably though not necesarrily free) software > that can do this? I'm working in Python, but not limited to it as I > can relatively freely access other languages. Jasper, Use R (a free implementation of S). See http://www.rproject.org If you are managing your data in Python and NumPy, you can "embed" R in Python and transparently send data to it using Walter Moreira's wonderful RPy module  see http://rpy.sf.net Tim C 
From: Perry Greenfield <perry@st...>  20020429 20:21:12

> Sebastian Haase writes: > > Hi all, > I'm _very_ new to NumPy. > I was interested in using it for our project, where we acquire > data from a > CCD camera. > > The Problem: Each pixel in the image is a 16 bit gray value. > What I read in the documentation  there is only 8 > bit (unsigned > integer) support in numpy (or should I say numericarray) > > Are there plans to add a "unsigned short" (16 bit) support . > How much effort would that be. > There is a reimplemenation of Numeric that we are doing that does support unsigned ints (Unsigned Int8, Unsigned Int16 for now). The project is not mature, but a lot of basic cabability exists now. You'll have to look it over to judge if it is usable for you now. The new version is called numarray ( http://stsdas.stsci.edu/numarray ) (btw, we acquire data from CCD cameras as well ;) Perry 
From: Rick Ree <rick@bi...>  20020429 18:34:21

Should Numeric.array([0]) test false? This seems counterintuitive, and is not the case for the regular python array module. This recently caused a subtle bug for me when I wanted to find the indices of an array that met a condition. If only the first element met the condition, the result was array([0])  a nonempty result that evaluated false. If this is the intended behavior, can someone tell me the reason? thanks, Rick 
From: Sebastian Haase <haase@ms...>  20020429 18:16:50

Hi all, I'm _very_ new to NumPy. I was interested in using it for our project, where we acquire data from a CCD camera. The Problem: Each pixel in the image is a 16 bit gray value. What I read in the documentation  there is only 8 bit (unsigned integer) support in numpy (or should I say numericarray) Are there plans to add a "unsigned short" (16 bit) support . How much effort would that be. Regards, Sebastian Haase  _\\//_ (' OO ') ooO(_)Ooo Sebastian Haase University of California, San Francisco (415)5024316 
From: Todd Miller <jmiller@st...>  20020429 17:13:56

Numarray 0.3.3  Numarray is an array processing package designed to efficiently manipulate large multidimensional arrays. Numarray is modelled after Numeric and features ccode generated from python template scripts, the capacity to operate directly on arrays in files, and improved type promotions. Numarray0.3.3 features improved support for arrays of complex numbers, reimplementing complex types using generated code. In addition to being faster, the new complex ufuncs are better integrated with the numarray type system, so operations between numarrays and complex scalars now work properly. This release also fixes a problem experienced by RedHat Linux users installing numarray from source. WHERE  Numarray0.3.3 windows executable installers and source code tar ball is here: http://sourceforge.net/project/showfiles.php?group_id=1369 Numarray is hosted by Source Forge in the same project which hosts Numeric: http://sourceforge.net/projects/numpy/ The web page for Numarray information is at: http://stsdas.stsci.edu/numarray/index.html Trackers for Numarray Bugs, Feature Requests, Support, and Patches are at the Source Forge project for NumPy at: http://sourceforge.net/tracker/?group_id=1369 REQUIREMENTS  numarray0.3.3 requires Python 2.0 or greater. AUTHORS, LICENSE  Numarray was written by Perry Greenfield, Rick White, Todd Miller, JC Hsu, Paul Barrett, Phil Hodge at the Space Telescope Science Institute. Thanks go to Jochen Kupper of the University of North Carolina for his work on Numarray and for porting the Numarray manual to TeX format. Numarray is made available under a BSDstyle License. See LICENSE.txt in the source distribution for details.  Todd Miller jmiller@... 
From: <cavallo@ki...>  20020429 17:09:36

hy, here is the url last version of kdfio a khoros/cantata kdf file importer: nothing special, but it seems working now, at least for me;) You can find it at: http://kdfio.sourceforge.net This is my (very) small contribution to the numerical python: inside i plugged a way to modularize the code (and writing some skeleton semiautomatically) that could speed up a litte bit writing new code. Before to give a full announcement on sourceforge i will wait a little bit, just to see if there are no bugs around. Fell free to use/change/make what you want, thanks to all, antonio cavallo ps. khoros is available at http://www.khoral.com and it is not a free program: there is just a free student version. 
From: Alexandre <Alexandre.F<ayolle@lo...>  20020429 13:27:46

On Mon, Apr 29, 2002 at 03:19:37PM +0200, Alexandre wrote: > I'm helping my wife with her History PhD, and have to deal with similar > stuff. I found R to be a very useful environment for statistical > computations. R is a free software clone of Splus, which is to statistics > what Matlab is to linear algebra and automation. Woops, I forgot to add a couple of URLs: The R project website http://www.rproject.org/ The Comprehensive R Archive Network (CRAN) http://cran.rproject.org/ Using R from Python http://rpy.sourceforge.net/ Using R from Python and Python from R (coding R extensions in Python) http://www.omegahat.org/RSPython/ Cheers, Alexandre Fayolle  LOGILAB, Paris (France). http://www.logilab.com http://www.logilab.fr http://www.logilab.org Narval, the first software agent available as free software (GPL). 
From: Alexandre <Alexandre.F<ayolle@lo...>  20020429 13:19:48

On Mon, Apr 29, 2002 at 03:13:44AM 0700, Jasper Phillips wrote: > I'm helping my wife with programming for her economics thesis, which needs > to calculate a "Multiple Linear Regression" on her data. > > Does anyone know of any (preferably though not necesarrily free) software > that can do this? I'm working in Python, but not limited to it as I > can relatively freely access other languages. > > I'm still looking for a library written in Python, but haven't had any luck. > I'm helping my wife with her History PhD, and have to deal with similar stuff. I found R to be a very useful environment for statistical computations. R is a free software clone of Splus, which is to statistics what Matlab is to linear algebra and automation. Pros:  programming environment, with a high level programming language  extensive statistical and linalg library (using C and FORTRAN code)  lots of third party code available, covering a very wide range of situations  Python bindings available if you don't want to learn the Schemelike language  Tons of documentation available  Excellent support through the mailing lists  GPL'd  Tons of way to import data (ranging from CSV files to ODBC queries)  2 printed books available, at Springer Verlag  postscript, png, wmf, X outputs, with precise control of the layout of the graphs and figures available for a nice colourful thesis Cons:  the language can be a bit weird at times (it took me some time to get used to '.' being used instead of '_' and vice versa in the scoping and variable naming), but you can use Python to script R, thanks to RPython  it's quite a big piece of code, with a rather steep learning curve and you need time to get inside it  the documentation is aimed at professional statisticians. I had to dig back in my statistics courses and to buy a couple of books on that topic for the software to become really useful. Asking newbie statistician questions on the rhelp mailing list is offtopic  the springer verlag books are very expensive (Modern Applied Statistics with Splus costs something like 70 euros), but they are great So you have a powerful tool available at your fingertips, designed to do precisely what you need. I think it's worth taking the time to look at it carefully. The more I get to understand the topic, the more ideas I get for new ways of exploring the data of my wife's PhD. Alexandre Fayolle  LOGILAB, Paris (France). http://www.logilab.com http://www.logilab.fr http://www.logilab.org Narval, the first software agent available as free software (GPL). 
From: Konrad Hinsen <hinsen@cn...>  20020429 12:39:06

Jasper Phillips <jasper@...> writes: > I'm still looking for a library written in Python, but haven't had any luck. Numerical Python has all the basic stuff, but you need to read in and arrange the data yourself. All linear regression problems ultimately become leastsquares problems for a system of linear equations, which can be solved using LinearAlgebra.linear_least_squares. Konrad. 
From: Jasper Phillips <jasper@pe...>  20020429 10:13:48

I'm helping my wife with programming for her economics thesis, which needs to calculate a "Multiple Linear Regression" on her data. Does anyone know of any (preferably though not necesarrily free) software that can do this? I'm working in Python, but not limited to it as I can relatively freely access other languages. I'm still looking for a library written in Python, but haven't had any luck. My second thought was Matlab, but looking over the Matlab website, I couldn't find anything like this by a name I recognize. It looks like I might be able to construct something out of a combination of Sparse Matrices and Linear Regesstion, or perhaps the stuff for overdetermined Linear Equations? Another option may be LAPACK routines, but I'm not familiar with those. Does anyone here have any experience with this kind of stuff? Is there a better place to ask? I'm about ready to take a shot at writing something myself, but I'd really rather avoid this if it's been done before. Jasper 