[SciPy-Dev] seeded randn gets different values on osx

Vincent Davis vincent@vincentdavis....
Sun Jun 13 12:17:24 CDT 2010


On Sun, Jun 13, 2010 at 9:46 AM, Matthew Brett <matthew.brett@gmail.com>wrote:

> Hi,
>
> >> After a little discusion with Josef here are some results. It appears
> >> to me that osx gets different values from a seeded randn
> >
> >> On my machine OSX py 2.6.5, numpy 1.4.0 scipy 8.0b
> >>>>>> np.random.seed(0)
> >>>>>> np.random.randn(3)
> >>> array([ 0.06897149,  1.32078057,  1.5997924 ])
>
> Nor in a numpy-1.4.0 virtualenv:
>
> In [1]: import numpy as np
>
> In [2]: np.__version__
> Out[2]: '1.4.0'
>
> In [3]: np.random.seed(0)
>
> In [4]: np.random.randn(3)
> Out[4]: array([ 1.76405235,  0.40015721,  0.97873798])
>

I just built 2.6 from current daily snapshot and installed numpy. Now I get
the right answer

MacBookPro-new-2:~ vmd$ py26
Python 2.6.5+ (release26-maint, Jun 13 2010, 10:02:04)
[GCC 4.2.1 (Apple Inc. build 5659)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import numpy as np
>>> np.random.seed(0)
>>> np.random.randn(3)
array([ 1.76405235,  0.40015721,  0.97873798])

So I guess there is something wrong with the enthought 6.2 dist.

Should there be a test added for this type of error?

Thanks
Vincent


> Best,
>
> Matthew
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  *Vincent Davis
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