[Numpy-discussion] problem with numpy.. sometimes using numarray? and selection question (original) (raw)

Eric Emsellem emsellem at obs.univ-lyon1.fr
Thu Jun 15 09:35:20 EDT 2006

Hi,

I have written a number of small modules where I now systematically use numpy.

I have in principle used the latest versions of the different array/Science modules (scipy, numpy, ..) but still at some point during a selection, it crashes on numpy because it seems that the array correspond to "numarray" arrays.

e.g.: ################################## selection = (rell >= 1.) * (rell < ES0.maxEFFR[indgal]) ##################################

rell is an array of reals and ES0.maxEFFR[indgal] is a real number.

gives the error:

/usr/local/lib/python2.4/site-packages/numarray/numarraycore.py:376: UserWarning: array returned non-NumArray instance _warnings.warn("array returned non-NumArray instance") /usr/local/lib/python2.4/site-packages/numarray/ufunc.py in _cache_miss2(self, n1, n2, out) 919 (in1, in2), inform, scalar = _inputcheck(n1, n2) 920 --> 921 mode, win1, win2, wout, cfunc, ufargs =
922 self._setup(in1, in2, inform, out) 923

/usr/local/lib/python2.4/site-packages/numarray/ufunc.py in _setup(self, in1, in2, inform, out) 965 if out is None: wout = in2.new(outtypes[0]) 966 if inform == "vv": --> 967 intypes = (in1._type, in2._type) 968 inarr1, inarr2 = in1._dualbroadcast(in2) 969 fform, convtypes, outtypes, cfunc = self._typematch_N(intypes, inform)

AttributeError: 'numpy.ndarray' object has no attribute '_type'

QUESTION 1: Any hint on where numarray could still be appearing?

QUESTION 2: how would you make a selection using "and" and "or" such as: selection = (condition 1) "and" (condition2 "or" condition3) so that "selection" contains 0 and 1 according to the right hand side.

Thanks,

Eric P.S.: my config is:

matplotlib version 0.87.3 verbose.level helpful interactive is False platform is linux2 numerix numpy 0.9.9.2624 font search path ['/usr/local/lib/python2.4/site-packages/matplotlib/mpl-data'] backend GTKAgg version 2.8.2 Python 2.4.2 (#1, May 2 2006, 08:13:46) IPython 0.7.2 -- An enhanced Interactive Python.

I am using numerix = numpy in matplotlibrc. I am also using NUMERIX = numpy when building pyfits.

--

Eric Emsellem emsellem at obs.univ-lyon1.fr Centre de Recherche Astrophysique de Lyon 9 av. Charles-Andre tel: +33 (0)4 78 86 83 84 69561 Saint-Genis Laval Cedex fax: +33 (0)4 78 86 83 86 France http://www-obs.univ-lyon1.fr/eric.emsellem

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