[Numpy-discussion] random permutation
kwgoodman at gmail.com
Sat Jan 13 12:26:45 CST 2007
On 1/13/07, Sebastian Haase <seb.haase at gmx.net> wrote:
> On 1/13/07, Keith Goodman <kwgoodman at gmail.com> wrote:
> > On 1/11/07, Robert Kern <robert.kern at gmail.com> wrote:
> > > Keith Goodman wrote:
> > > > Why is the first element of the permutation always the same? Am I
> > > > using random.permutation in the right way?
> > >
> > > >>> M.__version__
> > > > '1.0rc1'
> > >
> > > This has been fixed in more recent versions.
> > >
> > > http://projects.scipy.org/scipy/numpy/ticket/374
> > I don't see any unit tests for numpy.random. I guess randomness is hard to test.
> > Would it help to seed the random number generator and at least check
> > that you get the same result you got before? No existing problems
> > would be found. But new ones might be caught.
> Is it guaranteed that a given seed produces the same sequence of
> rand-number between different platforms ?
> I thought this might only be guaranteed for "any given computer" to
> reproduce the same numbers.
I hope, and expect, that it is system independent.
Here's what I get:
>> rs = numpy.random.RandomState([123, 901, 789])
array([[ 0.184306 ],
Linux kel 2.6.18-3-686 #1 SMP Mon Dec 4 16:41:14 UTC 2006 i686 GNU/Linux
More information about the Numpy-discussion