[Numpy-discussion] random and RandomArray
southey at uiuc.edu
Thu Feb 17 07:28:19 CST 2005
The Mersenne Twister is available in Python as:
This file contains the outdated information:
"The code in this module was based on a download from:
The redirected link is titled: Mersenne Twister with improved initialization
A brief look at randlib() suggests that it is written so that different uniform
generators could be used. Could randf() be rewritten to have the default
(current status) function and a second that just to link to the random module
library to use the Mersenne Twister?
Okay, I do know it is not that easy (the seed code would also need to change so
account for which generator is being used) but may be sufficient.
---- Original message ----
>Date: Wed, 16 Feb 2005 20:05:09 -0800
>From: Robert Kern <rkern at ucsd.edu>
>Subject: Re: [Numpy-discussion] random and RandomArray
>To: numpy-discussion at lists.sourceforge.net
>Bruce Southey wrote:
>> I was browsing through some of the code and realized that certain random
>> generators occur in both the Python random module and RandomArray.
>> The random module uses C code to get a scalar uniform random number that is
>> modified in Python by other generators to get random numbers from other
>> distributions. In RandomArray everything is done in the C code - obviously
>> is way faster especially for arrays.
>> In the long term, would it make sense to get use the same random number
>> generators in both random and RandomArray?
>I think that it is certainly feasible and desirable that when/if a
>multiarray object enters the standard library that the standard random
>module be extended to produce arrays as well.
>I don't think it's terribly worthwhile to hack the random module to
>expose its PRNG so that we use it's implementation without duplicating
>code. I think the result will be quite fragile, and won't be useful
>until Python 2.5.
>I do think it would be extremely worthwhile to implement the Mersenne
>Twister for numarray/scipy. I promised some time ago to look into this,
>but I have not gotten around to it, unfortunately.
>rkern at ucsd.edu
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