[Numpy-discussion] Re: A random.normal function with stdev as array

Robert Kern robert.kern at gmail.com
Wed Apr 5 11:35:01 CDT 2006


> Bruce Southey wrote:

>>>From a different view, you need to be very careful with your
>>(pseudo)random number generator with that many samples. These have a
>>tendency to repeat so your random number stream is no longer random.
>>See the Wikipedia entry:
>>http://en.wikipedia.org/wiki/Pseudorandom_number_generator
>>
>>If I recall correctly, the Python random number generator is a
>>Mersenne twister but ranlib  is not and so prone to the mentioned
>>problems. I do not know if SciPy adds any other generators.

numpy.random uses the Mersenne Twister. RANLIB is dead! Long live MT19937!

-- 
Robert Kern
robert.kern at gmail.com

"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





More information about the Numpy-discussion mailing list