NumPy-Discussion September 2006

numpy-discussion@python.org

132 participants
166 discussions

record descriptors: trailing unused bytes
by Martin Wiechert 18 Sep '06

18 Sep '06

Hi list, does anybody know, if in C in the PyArray_Descr struct it is safe to manually change descr->elsize and descr->alignment as long as these are compatible and descr->elsize is large enough to hold all fields? Of course I mean before any array is constructed using descr. Thanks, Martin.

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visual programming
by Mathew Yeates 18 Sep '06

18 Sep '06

semi off topic. Does anyone know of any good visual programming tools? Forever ago, I used to use something called Khoros for image processing and I found it very useful. You connect boxes which represent different processing steps. At about the same time, there was something similar to Khoros from SGI. Explorer was its name, I think. Anybody out there use this sort of thing? Matlab doesn't offer it, right? Nor matplotlib? Mathew

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Segfault on byteswap() on recarrays
by Matthew Brett 18 Sep '06

18 Sep '06

Hi, I noticed this works: In [5]:a = array((1,), dtype=[('one', '<i4')]) In [6]:a.byteswap() Out[6]: array((16777216,), dtype=[('one', '<i4')]) But, extending the recarray leads to a segfault on byteswapping: In [8]:a = array((1, 2), dtype=[('one', '<i4'),('two', '<i4')]) In [9]:a.byteswap() Segmentation fault Thanks, Matthew

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Re: [Numpy-discussion] buggy buggy bugyy: format and casting ==> BUG in numpy.sum?
by Eric Emsellem 18 Sep '06

18 Sep '06

Hi again after some hours of debugging I finally (I think) found the problem: numpy.sum([[0,1,2],[2,3,4]]) 24 numpy.sum([[0,1,2],[2,3,4]],axis=0) array([2, 4, 6]) numpy.sum([[0,1,2],[2,3,4]],axis=1) array([3, 9]) Isn't the first line supposed to act as with "axis=0" by default (see help numpy.sum!)...??? Not setting axis=0 it sums everything! Is that the expected behaviour or is the doc not updated? (I realise it may be better to force axis=.. to indicate what you need but still.. the example in numpy.sum help gives: sum([[0, 1], [0, 5]]) array([0, 6]) which is not what it gives when you do it...) thanks Eric

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static build
by Mike Rovner 18 Sep '06

18 Sep '06

I need build core numpy (plus possible dft) static into python.a Can someone point me to the right direction. Currently I built some libs but blocked on _internal. From my Setup.local: NPSRC=/home/mrovner/src/numpy-0.9.8 NPBLD=$(NPSRC)/build/src.linux-i686-2.4 NPINC=-I$(NPSRC)/numpy/core/include -I$(NPBLD)/numpy/core -I$(NPSRC)/numpy/core/src multiarray $(NPSRC)/numpy/core/src/multiarraymodule.c $(NPINC) umath $(NPBLD)/numpy/core/src/umathmodule.c $(NPINC) scalarmath $(NPBLD)/numpy/core/src/scalarmathmodule.c $(NPINC) _sort $(NPBLD)/numpy/core/src/_sortmodule.c $(NPINC) _compiled_base $(NPSRC)/numpy/lib/src/_compiled_base.c $(NPINC) Thanks, Mike

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Changing byte ordering with astype fails with 0d arrays
by Matthew Brett 18 Sep '06

18 Sep '06

Hi, As expected: In [67]:a = array([1], dtype='<i4') In [68]:a.astype('>i4').dtype Out[68]:dtype('>i4') I was also expecting this to work for 0d arrays, but it doesn't: In [69]:a = array(1, dtype='<i4') In [70]:a.astype('>i4').dtype Out[70]:dtype('<i4') Is this as intended? Thanks a lot, Matthew

2 1

recarray
by Lionel Roubeyrie 18 Sep '06

18 Sep '06

Hi all, I try to use recarray with rec.fromrecords on time-series, datas come from a file where they are stored in csv format, with after each data colum there is one column meanning the state of the data, and the first column is for dates. Then, is it possible to directly transform column of strings to a integer one (or datetime one), and to remove a not used column? thanks -- Lionel

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mournful
by Louisa Mata 17 Sep '06

17 Sep '06

This may have been regularan then again it may have been queer. Bilyen made a careful inspection of the spot, and then faced Brazos witha curious fire in his eyes. I raisedthe ante to two thousand dollars. Give me the lowdown on rustlin in eastern Colorado. Suddenly she sprang out from the wall, formidable as a tigress. Without any greeting, Brazos flung a query at the banker. Yu-all shorehave heahed of the Sewall McCoy combine with Russ Slaughter. Shes the most fascinating girl I ever met. But he could be made a target for speech thatwould sweep over town like fire in prairie grass. At the foot of the Odd Fellows stairway Brazos halted to load his gun. Father hasa deal on with Surface and Miller. I mixed with cowboys,cattlemen, gamblers, an town folks. Cross the street heah an walk up thetside an down on this side. Yu men held upNeece thet night an robbed him. Wal, this gang of three was after himfor reasons that bear strong in this deal. An lettin that gambler Howard runaround with her. Range talk blames me for alot thet Im innocent of. She met his piercing gaze with understanding, and avisible shudder. If they would be, yud never get a vote,onless from some of yore hired hands. No noticeable change showed in the ranchers pale face. Dealing Surface a powerful left-handed blow,Brazos knocked him flat. Lura designated her bag, which Brazostook up. Whats to keep mefrom shootin Raine Surfaces laig off?

1 0

compile error with python2.5
by Achim Gaedke 17 Sep '06

17 Sep '06

Hi! I compiled numpy-1.0b5 with python2.5 on debian testing and raIn file included from numpy/core/src/multiarraymodule.c:65: numpy/core/src/arrayobject.c: In function 'PyArray_PyIntAsIntp': numpy/core/src/arrayobject.c:564: error: 'op' undeclared (first use in this function) numpy/core/src/arrayobject.c:564: error: (Each undeclared identifier is reported only once numpy/core/src/arrayobject.c:564: error: for each function it appears in.) numpy/core/src/arrayobject.c:565: warning: cast from pointer to integer of different size numpy/core/src/arrayobject.c: In function 'PyArray_PyIntAsInt': numpy/core/src/arrayobject.c:654: warning: cast from pointer to integer of different size numpy/core/src/arrayobject.c: In function 'array_subscript': numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union In file included from numpy/core/src/multiarraymodule.c:65: numpy/core/src/arrayobject.c: In function 'PyArray_PyIntAsIntp': numpy/core/src/arrayobject.c:564: error: 'op' undeclared (first use in this function) numpy/core/src/arrayobject.c:564: error: (Each undeclared identifier is reported only once numpy/core/src/arrayobject.c:564: error: for each function it appears in.) numpy/core/src/arrayobject.c:565: warning: cast from pointer to integer of different size numpy/core/src/arrayobject.c: In function 'PyArray_PyIntAsInt': numpy/core/src/arrayobject.c:654: warning: cast from pointer to integer of different size numpy/core/src/arrayobject.c: In function 'array_subscript': numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union numpy/core/src/arrayobject.c:2694: error: request for member 'ob_type' in something not a structure or union error: Command "gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC -Ibuild/src.linux-i686-2.5/numpy/core/src -Inumpy/core/include -Ibuild/src.linux-i686-2.5/numpy/core -Inumpy/core/src -Inumpy/core/include -I/home/achim/local/include/python2.5 -c numpy/core/src/multiarraymodule.c -o build/temp.linux-i686-2.5/numpy/core/src/multiarraymodule.o" failed with exit status 1 n into errors I fixed it by guessing the correct arguments. The patch is attached. I hope someone can revise this fix. Achim diff -ru numpy-1.0b5/numpy/core/src/arrayobject.c numpy-1.0b5_fixed/numpy/core/src/arrayobject.c --- numpy-1.0b5/numpy/core/src/arrayobject.c 2006-09-05 00:41:47.000000000 +0200 +++ numpy-1.0b5_fixed/numpy/core/src/arrayobject.c 2006-09-17 21:41:49.000000000 +0200 @@ -561,8 +561,8 @@ return ret; } #if (PY_VERSION_HEX >= 0x02050000) - if (PyIndex_Check(op)) { - long_value = (longlong) PyNumber_Index(op); + if (PyIndex_Check(o)) { + long_value = (longlong) PyNumber_Index(o); goto finish; } #endif @@ -2691,7 +2691,7 @@ } if (PyInt_Check(op) || PyArray_IsScalar(op, Integer) || - PyLong_Check(op) || PyIndex_Check(index)) { + PyLong_Check(op) || PyIndex_Check(op)) { intp value; value = PyArray_PyIntAsIntp(op); if (!PyErr_Occurred()) {

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PHAxqiRMA
by Aksel Booth 17 Sep '06

17 Sep '06

Hi d V x I d A d G o R m A s V w A f L p I p U l M l C q I n A t L e I z S e A x M g B u I b E o N k X d A w N w A q X S y AV o E up to 6 t 0 % w e it c h http://www.ylutriamoa.info <http://www.ylutriamoa.info>

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NumPy-Discussion September 2006