On Tue, Mar 29, 2011 at 4:00 AM, tvn wrote:
> I'd like to be able to regenerate samples by feeding a seed value to
> random.seed() , but it seems sample() doesn't use this random seed. Is
> there a way to do what I want ?
help(sage.misc.randstate) explains a lot of the gory details.
set_random_seed() controls the _Sage_ random seed, but I think if
you're replacing the random() function with the Python random module
(to use random.random() instead of just random()) you're going to have
to set both:
sage: reset()
sage: import random
sage:
sage: # try just set_random_seed..
sage: set_random_seed(1)
sage: random.random()
0.84743373693723267
sage: sample(range(5),2)
[4, 2]
sage:
sage: set_random_seed(1)
sage: random.random()
0.76377461897661403
sage: # that didn't work..
sage: sample(range(5),2)
[4, 2]
sage: # but this did!
sage:
sage: # so we have to use both..
sage: set_random_seed(1) # for Sage
sage: random.seed(1) # for Python random module
sage: random.random()
0.13436424411240122
sage: sample(range(5),2)
[4, 2]
sage:
sage: set_random_seed(1) # for Sage
sage: random.seed(1) # for Python random module
sage: random.random()
0.13436424411240122
sage: sample(range(5),2)
[4, 2]
Doug
--
Department of Earth Sciences
University of Hong Kong
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