Mailman 3 March 2012 - NumPy-Discussion

GSoC 2012
by josef.pktd＠gmail.com March 26, 2012

March 26, 2012

What happened to any plans for GSOC? http://wiki.python.org/moin/SummerOfCode/2012 Josef

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Using logical function on more than 2 arrays, availability of a "between" function ?
by Matthieu Rigal March 26, 2012

March 26, 2012

Dear Numpy fellows, I have actually a double question, which only aims to answer a single one : how to get the following line being processed more efficiently : array = numpy.logical_and(numpy.logical_and(aBlueChannel < 1.0, aNirChannel > (aBlueChannel * 1.0)), aNirChannel < (aBlueChannel * 1.8)) One possibility would have been to have the logical_and being able to handle more than two arrays Another one would have been to be able to make a "double comparison" or a "between", like following one : array = numpy.logical_and((aBlueChannel < 1.0), (1.0 < aNirChannel/aBlueChannel < 1.8)) Is there any way to get the things work this way ? Would it else be a possible improvement for 1.7 or a later version ? Best Regards, Matthieu Rigal RapidEye AG Molkenmarkt 30 14776 Brandenburg an der Havel Germany Follow us on Twitter! www.twitter.com/rapideye_ag Head Office/Sitz der Gesellschaft: Brandenburg an der Havel Management Board/Vorstand: Ryan Johnson Chairman of Supervisory Board/Vorsitzender des Aufsichtsrates: Robert Johnson Commercial Register/Handelsregister Potsdam HRB 24742 P Tax Number/Steuernummer: 048/100/00053 VAT-Ident-Number/Ust.-ID: DE 199331235 DIN EN ISO 9001 certified

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numpydoc.traitsdoc error
by Brad Buran March 25, 2012

March 25, 2012

Not sure if this is the appropriate place to report the issue, but I've been getting the following error when trying to build my docs using Sphinx 1.1.3: File "C:\Python27\lib\site-packages\numpydoc\numpydoc.py", line 36, in mangle_docstrings doc = get_doc_object(obj, what, u"\n".join(lines), config=cfg) TypeError: get_doc_object() got multiple values for keyword argument 'config' Full traceback is attached. Is anyone else having a similar issue? Thanks, Brad

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Inconsistent type name formatting.
by Charles R Harris March 24, 2012

March 24, 2012

Example: In [40]: array([1, 2], dtype('>l')).dtype Out[40]: dtype('>i8') In [41]: array([1, 2], dtype('<l')).dtype Out[41]: dtype('int64') In [42]: array([1, 2], dtype('>q')).dtype Out[42]: dtype('>i8') In [43]: array([1, 2], dtype('<q')).dtype Out[43]: dtype('int64') In [44]: array([1, 2], dtype('>M8[D]')).dtype Out[44]: dtype('>M8[D]') In [45]: array([1, 2], dtype('<M8[D]')).dtype Out[45]: dtype('<M8[D]') I rather like the '>i8' form with '<' if appropriate, although it's probably a bit late to do anything about it. The datetime requires a patch to generate the swapped form. Long term, it might be good to strive for consistency. Thoughts? Chuck.

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f2py and pygtk on windows
by Sameer Grover March 24, 2012

March 24, 2012

>>>import gtk >>>import foo # where foo is any f2py-wrapped program Subsequently, on exiting python interpreter, the interpreter crashes with this error message - "This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information." Strangely enough, interchanging the order of the import statements, i.e. importing the f2py wrapped program before gtk works fine. Furthermore, each module works fine individually. This is a windows-only problem. I'm using Windows 7, Python 2.7, latest numpy, mingw32 compiler and the "pygtk all-in-one installer" (mentioned on the pygtk download page). This happens even for very simple fortran programs such as this one - subroutine hello () write(*,*)'Hello from Fortran90!!!' end subroutine hello I don't know whether the problem is with f2py or with gtk or with python but maybe somebody can shed some light on this. Regards, Sameer Grover

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Pull request for pad functions
by Tim Cera March 23, 2012

March 23, 2012

Hello, I have a pull request to add a n-dimensional array padding feature at https://github.com/numpy/numpy/pull/198 This message is only to prod for a final review. Much thanks to Warren Weckesser and Travis Oliphant for their help in finding some bugs and working on style and API issues. I think it looks pretty good right now. Kindest regards, Tim

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Crashes and test failures
by Gael Varoquaux March 23, 2012

March 23, 2012

Hi list, I just got a new laptop, running Ubuntu 11.10 64bit on an Intel i7. I am a bit intriged by the test results of numpy on this box. First of all, master builds and imports OK, but the simplest test case crashes with a segfault: import numpy as np a = np.ones(10, dtype=np.bool) np.all(a) Am I the only one to see this? If so, I am wiling to investigate, but I'll need a bit of help, as I had a look with gcc, and the crash seems burried deep in the guts of numpy. Second, I backed out a bit, and checkout out the 1.6.1 tag. It builds alright and doesn't segfault, but I am getting a few test failures (pasted at the end of the mail). I haven't been following the mailing list well-enough lately, so I am unsure: are these known failure. I was surprised to find a tag that looked like a release with failures. Sorry if I am asking stupid questions, finding master unusable at first glance for me was a bit offseting. Gael ====================================================================== ERROR: Failure: ImportError (cannot import name fib2) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/f2py_ext/tests/test_fib2.py", line 3, in <module> from f2py_ext import fib2 ImportError: cannot import name fib2 ====================================================================== ERROR: Failure: ImportError (cannot import name foo) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/f2py_f90_ext/tests/test_foo.py", line 3, in <module> from f2py_f90_ext import foo ImportError: cannot import name foo ====================================================================== ERROR: Failure: ImportError (cannot import name fib3) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/gen_ext/tests/test_fib3.py", line 3, in <module> from gen_ext import fib3 ImportError: cannot import name fib3 ====================================================================== ERROR: Failure: ImportError (No module named primes) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/pyrex_ext/tests/test_primes.py", line 3, in <module> from pyrex_ext.primes import primes ImportError: No module named primes ====================================================================== ERROR: Failure: ImportError (cannot import name example) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/swig_ext/tests/test_example.py", line 3, in <module> from swig_ext import example ImportError: cannot import name example ====================================================================== ERROR: Failure: ImportError (cannot import name example2) ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/loader.py", line 390, in loadTestsFromName addr.filename, addr.module) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 39, in importFromPath return self.importFromDir(dir_path, fqname) File "/usr/lib/pymodules/python2.7/nose/importer.py", line 86, in importFromDir mod = load_module(part_fqname, fh, filename, desc) File "/home/varoquau/dev/numpy/numpy/distutils/tests/swig_ext/tests/test_example2.py", line 3, in <module> from swig_ext import example2 ImportError: cannot import name example2 ====================================================================== FAIL: test_kind.TestKind.test_all ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/nose/case.py", line 187, in runTest self.test(*self.arg) File "/home/varoquau/dev/numpy/numpy/f2py/tests/test_kind.py", line 30, in test_all 'selectedrealkind(%s): expected %r but got %r' % (i, selected_real_kind(i), selectedrealkind(i))) File "/home/varoquau/dev/numpy/numpy/testing/utils.py", line 34, in assert_ raise AssertionError(msg) AssertionError: selectedrealkind(19): expected -1 but got 16 ----------------------------------------------------------------------

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[ANN] PyData workshop videos are up online, including panel with Guido
by Fernando Perez March 22, 2012

March 22, 2012

Hi all, just to let you know that the videos from the PyData workshop we held at Google a couple of weeks ago are now online (not all talks are up yet, so watch the page over the next few days if a talk you wanted to see isn't posted yet): http://marakana.com/s/2012_pydata_workshop,1090/index.html The panel discussion with Guido that we talked about on these lists is in there; I hope to write up a short summary about it soon. Many thanks to Simeon Franklin and the rest of the Marakana team for doing all this work (for free)! Cheers, f

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Trouble building NumPy on PPC64
by Andreas H. March 22, 2012

March 22, 2012

Hi all, I have troube installing numpy in a virtual environment on a SuSE Enterprise 11 server (ppc64). Here is what I did: curl -O https://raw.github.com/pypa/virtualenv/master/virtualenv.py python virtualenv.py --distribute --no-site-packages .virtualenvs/pydoas source .virtualenvs/pydoas/bin/activate pip install numpy And here is the outcome: SystemError: Cannot compile 'Python.h'. Perhaps you need to install python-dev|python-devel. However, Python.h exists, because I did install the python-devel package: (pydoas)hilboll@odin:~/.virtualenvs/pydoas/build/numpy> find /usr/include/ | grep Python.h /usr/include/python2.6/Python.h I also tried without the --distribute --no-site-packages flags, with the same result. Any hints are very welcome :) Cheers, Andreas.

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About np array and recarray
by Yan Tang March 22, 2012

March 22, 2012

Hi, I am really confused on the np array or record array, and cannot understand how it works. What I want to do is that I have a normal python two dimensional array/list: a = [['2000-01-01', 2],['2000-01-02', 3]] I want to convert it to a recarray with this dtype [('date', 'object'), ('count', 'int')]. I tried multiple ways and none of them works. And some of the tests show pretty odd behavior. This is good, and it is almost what i want: >>> import numpy as np >>> a = [('2000-01-01', 2), ('2000-01-02', 3)] >>> np.array(a, dtype=[('date', 'object'), ('count', 'int')]) array([('2000-01-01', 2), ('2000-01-02', 3)], dtype=[('date', '|O8'), ('count', '<i8')]) Why this doesn't work?! >>> a = [['2000-01-01', 2],['2000-01-02', 3]] >>> np.array(a, dtype=[('date', 'object'), ('count', 'int')]) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: tried to set void-array with object members using buffer. Why can this cause segmentation fault?! >>> a = [['2000-01-01', 2],['2000-01-02', 3]] >>> np.ndarray((len(a),), buffer=np.array(a), dtype=[('date', 'object'), ('count', 'int')]) Segmentation fault (And python quit!) Python version 2.6.5 On this reference page, http://docs.scipy.org/doc/numpy/reference/generated/numpy.array.html >>> x = np.array([(1,2),(3,4)]) >>> x array([[1, 2], [3, 4]]) >>> np.array([[1, 2], [3, 4]]) array([[1, 2], [3, 4]]) Can anyone help me about this? Thanks.

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