[Numpy-discussion] printable random seed ?
Robert Kern
robert.kern@gmail....
Wed Sep 22 09:34:50 CDT 2010
On Wed, Sep 22, 2010 at 09:27, <josef.pktd@gmail.com> wrote:
> I would like to generate random numbers based on a random seed, for
> example what numpy.random does if the seed is not specified. But I
> would also like to print out the initial state, so I can replicate the
> random numbers.
>
> Can I get a human readable or printable version of the initial state?
[~]
|13> prng = np.random.RandomState()
[~]
|14> prng2 = np.random.RandomState()
[~]
|15> prng.randint(100, size=10)
array([74, 62, 56, 94, 86, 59, 69, 94, 42, 18])
[~]
|16> prng2.randint(100, size=10)
array([21, 58, 34, 55, 9, 81, 45, 3, 93, 62])
[~]
|17> prng2.set_state(prng.get_state())
[~]
|18> prng.randint(100, size=10)
array([37, 57, 2, 0, 68, 9, 75, 88, 11, 7])
[~]
|19> prng2.randint(100, size=10)
array([37, 57, 2, 0, 68, 9, 75, 88, 11, 7])
[~]
|20> prng.get_state()
('MT19937',
array([1368120112, 957462593, 2623310617, 4207155283, 446940397,
3506388262, 4104366519, 371500243, 4029407620, 899392379,
....
1843090101, 2484333397, 4085469971, 306955884, 23307203,
1640066622, 48186677, 637144011, 854838500], dtype=uint32),
26,
0,
2.5933437794758841e-288)
> Alternatively, what's a good way to randomly generate an initial
> state?
np.random.RandomState() will do the best thing on each platform.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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