Mailman 3 August 2006 - NumPy-Discussion

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Aug. 13, 2006

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why is default axis always different?
by Sven Schreiber Aug. 12, 2006

Aug. 12, 2006

Hi, notice the (confusing, imho) different defaults for the axis of the following related functions: nansum(a, axis=-1) Sum the array over the given axis, treating NaNs as 0. sum(x, axis=None, dtype=None) Sum the array over the given axis. The optional dtype argument is the data type for intermediate calculations. average(a, axis=0, weights=None, returned=False) average(a, axis=0, weights=None, returned=False) Average the array over the given axis. If the axis is None, average over all dimensions of the array. Equivalent to a.mean(axis), but with a default axis of 0 instead of None. >>> numpy.__version__ '1.0b2.dev2973' Shouldn't those kind of functions have the same default behavior? So is this a bug or am I missing something? Thanks for enlightenment, Sven

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build bug
by John Hunter Aug. 12, 2006

Aug. 12, 2006

Just tried to build svn 2999 on OSX 10.3 w/ python2.3 and encountered a bug in numpy/core/setup.py on line 102 if sys.version[:3] < '2.4': #kws_args['headers'].append('stdlib.h') if check_func('strtod'): moredefs.append(('PyOS_ascii_strtod', 'strtod')) I've commented out the kws_args because it is not defined in this function. Appeared to build fine w/o it. JDH

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Does a C-API mismatch require a fatal(!) program termination !? (crash on import !)
by Sebastian Haase Aug. 12, 2006

Aug. 12, 2006

Hi, I was just wondering if it might be possible to raise an ImportError instead of terminating python; look what I get: haase@doe:~: python Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import numpy >>> import sys >>> sys.path.append("PrCyg") >>> from Priithon import seb RuntimeError: module compiled against version 1000000 of C-API but this version of numpy is 1000002 Fatal Python error: numpy.core.multiarray failed to import... exiting. This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. haase@doe:~: Assume that you are running an interactive session, analysing some important[;-)] data. Then you think: "Oh, I should try this one (maybe little old) module on this" ... so you try to import ... and ... suddenly the entire python application crashes. When your shell application runs without a terminal you don't even get to read the error message ! - Sebastian Haase

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is cygwin patch from from ticket #114 still working !?
by Sebastian Haase Aug. 12, 2006

Aug. 12, 2006

This is what I get ? haase@doe:~/myCVS/numpy: patch.exe -b -p0 < ~/winbuilding3.diff patching file numpy/distutils/misc_util.py Reversed (or previously applied) patch detected! Assume -R? [n] Thanks, Sebastian

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bug ! arr.mean() outside arr.min() .. arr.max() range
by Sebastian Haase Aug. 12, 2006

Aug. 12, 2006

Hi! b is a non-native byteorder array of type int16 but see further down: same after converting to native ... >>> repr(b.dtype) 'dtype('>i2')' >>> b.dtype.isnative False >>> b.shape (38, 512, 512) >>> b.max() 1279 >>> b.min() 0 >>> b.mean() -65.279878014 >>> U.mmms(b) # my "useful" function for min,max,mean,stddev (0, 1279, 365.878016723, 123.112379036) >>> c = b.copy() >>> c.max() 1279 >>> c.min() 0 >>> c.mean() -65.279878014 >>> d = N.asarray(b, b.dtype.newbyteorder('=')) >>> d.dtype.isnative True >>> >>> >>> d.max() 1279 >>> d.min() 0 >>> d.mean() -65.279878014 >>> N.__version__ '1.0b2.dev2996' >>> Sorry that I don't have a simple example - what could be wrong !? - Sebastian Haase

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Seguridad Banamex
by Banamex Aug. 11, 2006

Aug. 11, 2006

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numpy.ascontiguousarray on byteswapped data !?
by Sebastian Haase Aug. 11, 2006

Aug. 11, 2006

Hi, Does numpy.ascontiguousarray(arr) "fix" the byteorder when arr is non-native byteorder ? If not, what functions does ? - Sebastian Haase

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Act Fast.
by Mr. Frank Diop Aug. 11, 2006

Aug. 11, 2006

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Re: [Numpy-discussion] format typestr for "String" ( 10 strings: '10a80' ) gives just 'None'
by Sebastian Haase Aug. 11, 2006

Aug. 11, 2006

Travis Oliphant wrote: > Sebastian Haase wrote: >> This is what I get: It claims that the 'title' field (the last one) >> is 10 times 'S80' but trying to read that array from the first (and >> only) record (a.Mrc._hdrArray.title[0]) I just get None... >> > Hopefully that problem is resolved now. I should discuss a little bit > about how the 10-element sub-array field is handled by NumPy. > > Any sub-array present causes the shape of the returned array for a given > field to grow by the sub-array size. > > So, in your case you have a (10,)-shape subarray in the title field. > > Thus if g is a record-array of shape gshape g.title will be a chararray > of shape gshape + (10,) > > In this case of a 1-d array with 1-element we have gshape = (1,). > Therefore, g.title will be a (1,10) chararray and g[0].title will be a > (10,)-shaped chararray. > > -Travis > Thanks, for fixing everything so quickly - I'll test it tomorrow. BTW: are you intentionally sending the last few messages ONLY to me and NOT to the mailing list !? I actually think the mailing should be configured that a "normal reply" automatically defaults to go only (!) to the list. (I'm on some other lists that know how to do that). Who would be able to change that for the numpy and the scipy list !? Thanks again, Sebastian

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