[Numpy-discussion] bug in numpy.where?

Travis Oliphant travis@continuum...
Mon Jul 30 09:53:13 CDT 2012


Can you file a bug report on Github's issue tracker? 

Thanks,

-Travis

On Jul 26, 2012, at 1:33 PM, Phil Hodge wrote:

> On a Linux machine:
> 
>> uname -srvop
> Linux 2.6.18-308.8.2.el5 #1 SMP Tue May 29 11:54:17 EDT 2012 x86_64 
> GNU/Linux
> 
> this example shows an apparent problem with the where function:
> 
> Python 2.7.1 (r271:86832, Dec 21 2010, 11:19:43)
> [GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import numpy as np
>>>> print np.__version__
> 1.5.1
>>>> net = np.zeros(3, dtype='>f4')
>>>> net[1] = 0.00458849
>>>> net[2] = 0.605202
>>>> max_net = net.max()
>>>> test = np.where(net <= 0., max_net, net)
>>>> print test
> [ -2.23910537e-35   4.58848989e-03   6.05202019e-01]
> 
> When I specified the dtype for net as '>f8', test[0] was 
> 3.46244974e+68.  It worked as expected (i.e. test[0] should be 0.605202) 
> when I specified float(max_net) as the second argument to np.where.
> 
> Phil
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