ANN: numaray-0.7

Discussion in 'Python' started by Todd Miller, Aug 30, 2003.

  1. Todd Miller

    Todd Miller Guest

    numarray-0.7 has been released and is now available on Source Forge.

    Numarray is an array processing package designed to efficiently
    manipulate large multi-dimensional arrays. Numarray is modelled after
    Numeric and features c-code generated from python template scripts,
    the capacity to operate directly on arrays in files, and improved type
    promotions.

    I. ENHANCEMENTS

    1. Object Arrays

    numarray now has an object array facility. numarray.objects provides
    array indexing and ufuncs for fixed length collections of arbitrary
    Python objects.

    2. Merger of NumArray/ComplexArray classes

    Numarray's NumArray and ComplexArray classes have been unified into a
    single class. Thus, a single base class can be used to derive array
    classes which operate on integer, real or complex numbers. Thanks to
    Colin Williams for this suggestion.

    3. Indexing improvements

    The implementation of numarray's indexing has been simplified and
    improved. Ad-hoc logic for getting single array elements fast has
    been replaced by a full conversion to C of the top level of numarray's
    Python indexing code. The resulting code is simpler, prototyped in
    Python, and adds an additional kind of indexing which occurs entirely
    in C for speed: sub-arrays. Slicing and array indexing, however,
    still involve significant amounts of Python code.

    4. IEEE Special Value Constants

    Standard constants for nan, plus_inf, minus_inf, and inf have been
    added to numarray.ieeespecial making it easier to assign IEEE special
    values to arrays in addition to finding or replacing special values.

    5. Better Numeric interoperability (wxPyPlot port)

    numarray-0.7 addresses a couple compatibility and speed issues which
    hindered numarray's use with wxPyPlot. numarray now works fine with
    the wxPyPlot demos by changing "import Numeric" to "import numarray as
    Numeric".

    II. BUGS FIXED

    See
    http://sourceforge.net/tracker/?atid=450446&group_id=1369&func=browse
    for more details.

    793421 PyArray_INCREF / PyArray_XDECREF deprecated
    791354 Integer overflow bugs?
    785458 Crash subclassing the NumArray class
    784866 astype() fails sometimes
    779755 Mac OS 10 installation problem
    740035 Possible problem with dot

    III. CAUTIONS

    1. numarray extension writers should note that the documented use of
    PyArray_INCREF and PyArray_XDECREF (in numarray) has been found to be
    incompatible with Numeric and has therefore been deprecated. numarray
    wrapper functions using PyArray_INCREF and PyArray_XDECREF should
    switch to ordinary Py_INCREF and Py_XDECREF.

    2. Writers of numarray subclasses should note that the "protected"
    _getitem/_setitem interface for NDArray has changed.

    WHERE
    -----------

    Numarray-0.7 windows executable installers, source code, and manual 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
    ------------------------------

    numarray-0.7 requires Python 2.2.2 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. Thanks also to Edward C. Jones, Francesc Alted, Paul
    Dubois, Eric Jones, Travis Oliphant, Pearu Peterson, Colin Williams,
    and everyone who has contributed with comments and feedback.

    Numarray is made available under a BSD-style License. See LICENSE.txt
    in the source distribution for details.

    --
    Todd Miller
    Todd Miller, Aug 30, 2003
    #1
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