Mailman 3 April 2001 - NumPy-Discussion

simple array help?
by Pete Shinners 17 Sep '01

17 Sep '01

i have a simple array with floating values >>> print a array([ 0. , 0.2, 0.4, 0.6, 0.8]) what i need to do is change each index into another dimension with 3 indices. hmm, kind of confusing, an example will explain better >>> b = array(zip(a,a,a)) >>> print b array([[ 0. , 0. , 0. ], [ 0.2, 0.2, 0.2], [ 0.4, 0.4, 0.4], [ 0.6, 0.6, 0.6], [ 0.8, 0.8, 0.8]]) ok, this does the job, but once i start using large arrays, the back-n-forth conversion between arrays and python lists is costing me quite a bit. is there a way i can reshape the array this way without the call to python's 'zip'? (no, 'map' doesn't count either) i've tried much fooling with NewAxis, resize, and friends. but either i haven't stumbled upon the correct combination or i'm not trying the correct tools. i'd like to keep this as quick as possible, so hopefully it can be done without anything too elaborate. thanks (doh, sorry for the previous distutils related post... hit the wrong mailing list)

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Numpy install problems
by Michael D. Risser 27 Jul '01

27 Jul '01

When attempting to install Numeric 17.0 with Python 1.5.2 and Distutils 1.0 on Red Hat 7.0, I get the following error after issuing the command 'python setup.py install' Traceback (innermost last): File "setup.py", line 15, in ? vs = map(string.atoi, v.groups()) AttributeError: 'None' object has no attribute 'groups' This error occurs regardless of whether or not I am root. I have also tried uninstalling the Red Hat Python packages and installing all from source, but I get the same error. Any help would be appreciated. Thanks.

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[Q]Best way for an array operation?
by Daehyok Shin 04 May '01

04 May '01

What is the best Numpy way for the following work? for i in range(len(x)): if x[i] > 0: y[i] = v[i] z[i] = u[i]+2 Daehyok Shin (Peter)

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For Python 6.1b2 you need a new Pyfort
by Paul F. Dubois 03 May '01

03 May '01

There is a new Pyfort release 6.3 that lets Pyfort work with Python 6.1b2. Please get it from http://sourceforge.net/projects/pyfortran if you are using 6.1b2. This Pyfort will work just fine with any Python version it used to work with.

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Re: [Numpy-discussion] Can't assign sequence to PyObject array
by Stuart I Reynolds 30 Apr '01

30 Apr '01

Actually your example works for me too. Looks like only it only works for 1D arrays, >>> a1 = array([range(5), range(5)]).astype('O') >>> a1 array([[0 , 1 , 2 , 3 , 4 ], [0 , 1 , 2 , 3 , 4 ]],'O') >>> a2 = arange(6) >>> a2 array([0, 1, 2, 3, 4, 5]) >>> a1[1,1] = a2 Traceback (most recent call last): File "<stdin>", line 1, in ? ValueError: array too large for destination >>> a1 = arange(5).astype('O') >>> a1[1] = a2 >>> a1 array([0 , [0 1 2 3 4 5] , 2 , 3 , 4 ],'O') Hmm. This looks like a bug then. I'll submit a bug report. Cheers, Stuart On Thu, 19 Apr 2001, Pete Shinners wrote: > shoot, sorry then, i just tested it and it seemed happy, let me > try again here... > > >>> a1 = arange(5).astype('O') > >>> a2 = arange(5,9) > >>> a1 > array([0 , 1 , 2 , 3 , 4 ],'O') > >>> a2 > array([5, 6, 7, 8])

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[Annouce] Numeric Python 20.0.0b2
by Paul F. Dubois 26 Apr '01

26 Apr '01

Numpy has been restructured slightly to enable use of distutils to build: Source .tar.gz Source .zip Windows installer (a real installer, not just a zip you unzip) RPM Source RPM Individual Windows installers for optional packages You can get these from http://sourceforge.net/projects/numpy. Changes are: Version 20.0 Redo setup.py so that binary windows installers for Numeric, FFT, MA, etc. can be made automatically. Packages LALITE and RANLIB merged back to top level. Adjustment for BLAS in setup.py. Documentation of Numeric module made more compatible with pydoc. argmin/argmax/argsort/sort errors with axis specs fixed (bug #233805) -- also made them capable of handling args that can be converted to arrays by adding an array(a, copy=0) at the start. Fixes sum, product, cumsum, cumproduct, alltrue, sometrue to deal with zero shape and to take arguments that can be converted to arrays. MA: See changes.txt file in MA for bug fixes and improvements. New option for average to return sum of weights. Fix bug in putmask so that it handles targets of type object. Because of reference counting issues this is done in Python, not C, and would not be more efficient than doing your own loop, but we include it for completeness. In Packages add draft implementation for PEP 0242, Numerical Kinds. Add PyArray_CopyArray to the API (Thanks to Dave Grote). Add defines for cygwin. In arrayobject.h, add static declaration to importing API pointer. May solve OS X problems. Fix bug in FFT packages, added new test. (Thanks to Warren Focke) -- <a href="http://numpy.sourceforge.net">Numerical Python</a> -- a fast array facility for Python.

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Tagging the CVS repository
by Jack Jansen 25 Apr '01

25 Apr '01

I'd like to request that the CVS repository be tagged when a distribution is made. I'm building the MacPython 2.1 distribution (which includes numeric) and I was forced to include Numeric 20.0.0b2, because there wasn't a tag that allowed me to check out 19.0 or another stable release... -- 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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Numeric 20.0.0b2 on OS X
by Tim Lahey 25 Apr '01

25 Apr '01

All, It appears that Paul's changes to Numeric now allow the Numeric modules to at least be imported under Mac OS X. I'll be testing the code further in the next week or so. Thanks Paul! Cheers, Tim Lahey

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Installers for Numeric
by Paul F. Dubois 23 Apr '01

23 Apr '01

Dear Nummies, If you picked up the source installer for 20.0.0b2 in the first hour after I released it, it will die when building "kinds". Since you probably don't care, everything else will have been done by then. I have fixed both the .tar.gz and .zip source distributions now. This egregious error gives me the chance to say that I haven't the slightest idea whether the rpm and source rpm work. I just made 'em with Distutils. You rpm freaks out there will have to check it out and if it needs fixing, fix it. But we get so many people asking for those and for the Windows installers that I thought it worth a shot. Distutils burbled along pleasantly while making them, anyway. I did try the Windows installers and although they seem to work the "uninstall" didn't work for me. I have no clue if that is because that command isn't expected to work yet or not. Well informed, aren't I? Can you do better? Please do. == Paul

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Can't assign sequence to PyObject array
by Stuart I Reynolds 19 Apr '01

19 Apr '01

Is there a standard workaround to allow you to assign a sequence to a a single cell in PyObject array? from Numeric import * # Create a 2*5 array a = array([range(5),range(5)], PyObject) a[0,0] = 4 #OK - assigns an int to element 0,0 a[0,3] = {} #OK - assigns a dict # but, trying to assign an array to element 1,4 # (or any sequence) a[1,4] = array(range(10), Float) The last assignment causes, ValueError: array too large for destination error Doh!! Presumably its trying to treat this as an assignment to a slice. Is this a bug? Clearly it shouldn't be treated as a slice assignment since a[1,4] can only refer to an atomic element in the (2D) array, not a sequence. Cheers, Stuart

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