thanks for this information. Chao
2012/5/20 eat <e.antero.ta...@gmail.com> > Hi, > > On Sun, May 20, 2012 at 10:21 AM, Chao YUE <chaoyue...@gmail.com> wrote: > >> Dear all, >> >> could anybody give one sentence about this? why in the loop I didn't get >> zerodivision error by when I explicitly do this, I get a zerodivision >> error? thanks. >> >> In [7]: for i in np.arange(-10,10): >> print 1./i >> ...: >> -0.1 >> -0.111111111111 >> -0.125 >> -0.142857142857 >> -0.166666666667 >> -0.2 >> -0.25 >> -0.333333333333 >> -0.5 >> -1.0 >> inf >> 1.0 >> 0.5 >> 0.333333333333 >> 0.25 >> 0.2 >> 0.166666666667 >> 0.142857142857 >> 0.125 >> 0.111111111111 >> >> In [8]: 1/0. >> >> --------------------------------------------------------------------------- >> ZeroDivisionError Traceback (most recent call >> last) >> /mnt/f/data/DROUGTH/<ipython-input-8-7e0bf5b37da6> in <module>() >> ----> 1 1/0. >> >> ZeroDivisionError: float division by zero >> >> In [9]: 1./0. >> >> --------------------------------------------------------------------------- >> ZeroDivisionError Traceback (most recent call >> last) >> /mnt/f/data/DROUGTH/<ipython-input-9-3543596c47ff> in <module>() >> ----> 1 1./0. >> >> ZeroDivisionError: float division by zero >> >> In [10]: 1./0 >> >> --------------------------------------------------------------------------- >> ZeroDivisionError Traceback (most recent call >> last) >> /mnt/f/data/DROUGTH/<ipython-input-10-523760448f92> in <module>() >> ----> 1 1./0 >> >> ZeroDivisionError: float division by zero > > You may like to read more on here > http://docs.scipy.org/doc/numpy/reference/generated/numpy.seterr.html#numpy.seterr > > So, for your specific example: > In []: a= arange(-10, 10) > In []: 1./ a > Out[]: > array([-0.1 , -0.11111111, -0.125 , -0.14285714, -0.16666667, > -0.2 , -0.25 , -0.33333333, -0.5 , -1. , > inf, 1. , 0.5 , 0.33333333, 0.25 , > 0.2 , 0.16666667, 0.14285714, 0.125 , 0.11111111]) > In []: seterr(divide= 'raise') > In []: 1./ a > ------------------------------------------------------------ > Traceback (most recent call last): > File "<ipython console>", line 1, in <module> > FloatingPointError: divide by zero encountered in divide > > > My 2 cents, > -eat > >> >> >> >> Chao >> >> -- >> >> *********************************************************************************** >> Chao YUE >> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) >> UMR 1572 CEA-CNRS-UVSQ >> Batiment 712 - Pe 119 >> 91191 GIF Sur YVETTE Cedex >> Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16 >> >> ************************************************************************************ >> >> >> _______________________________________________ >> NumPy-Discussion mailing list >> NumPy-Discussion@scipy.org >> http://mail.scipy.org/mailman/listinfo/numpy-discussion >> >> > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > > -- *********************************************************************************** Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16 ************************************************************************************
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