It's py3 only, see the discussion in #3977.
On 25 Oct 2013 17:45, "Charles R Harris" <charlesr.har...@gmail.com> wrote:
>
>
>
> On Fri, Oct 25, 2013 at 7:07 AM, Andrew Straw
> <dr.andrew.st...@gmail.com>wrote:
>
>> Hi,
>>
>> I found an unexpected difference from numpy 1.7.1 and 1.8.0rc2 with
>> Python 3.3.2 on Ubuntu 12.04 (amd64). Here is the test program:
>>
>> import numpy as np
>> print(np.__version__)
>> K = np.array([[ 0. , 0. , 0. , 0. ],
>> [-0.33333333, 0. , 0. , 0. ],
>> [ 0.33333333, -0.33333333, 0. , 0. ],
>> [ 0.33333333, -0.33333333, 0.33333333, 0. ]])
>> w, V = np.linalg.eigh(K)
>> print('w')
>> print(w)
>>
>> with numpy 1.7.1:
>>
>> 1.7.1
>> w
>> [-0.33333333 -0.33333333 -0.33333333 0.99999999]
>>
>> with numpy 1.8.0rc2:
>>
>> 1.8.0rc2
>> w
>> [ 0. 0. 0. 0.]
>>
>
> This appears to have gotten fixed since rc2:
>
> In [1]: K = np.array([[ 0. , 0. , 0. , 0. ],
> [-0.33333333, 0. , 0. , 0. ],
> [ 0.33333333, -0.33333333, 0. , 0. ],
> [ 0.33333333, -0.33333333, 0.33333333, 0. ]])
>
> In [2]: eigh(K)
> Out[2]:
> (array([-0.33333333, -0.33333333, -0.33333333, 0.99999999]),
> array([[-0.78251031, 0.37104402, 0.00198815, 0.5 ],
> [-0.29974269, 0.03728557, 0.81164285, -0.5 ],
> [ 0.54246491, 0.46764373, 0.48686874, 0.5 ],
> [-0.05969728, -0.80140218, 0.32278596, 0.5 ]]))
>
> In [3]: np.__version__
> Out[3]: '1.8.0.dev-ced0a94'
>
> Could you try the current 1.8.x version on github and see if the problem
> persists?
>
> Chuck
>
>
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