Re: Problem this random seed()

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Date	2013-03-19 15:05 +0000
Subject	Re: Problem this random seed()
From	Sven <svenito@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.3516.1363705546.2939.python-list@python.org> (permalink)

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On 19 March 2013 14:44, NZach <nickzacharatos@gmail.com> wrote:

> OK, i changed the code again. Delete the G class (The purpose of G class
> was to refer to global variables). Add Rnd.seed(12345) in main() function.
> The new code : http://codeviewer.org/view/code:30da
>
> i print the Rnd.expovariate(ArrivalClass.ArvRate).
>
> The output i get be executing the above code is the following :
> ---
> 0.134729071364
> 0.00255530717358
> 0.0886834413113
>
> Result =  0.0571622124959
> 0.134729071364
> 0.00255530717358
> 0.0886834413113
>
> Result =  0.0453791550084
> ---
>
>
> So, the problem is probably with time (which is what @Stev mentioned
> before).
>
> But i still cant understand the reason. From the SimPy documentation :
> http://simpy.sourceforge.net/SimPyDocs/Manuals/SManual.html
> it says for the initialize(): "The initialize statement initialises global
> simulation variables and sets the software clock to 0.0. It must appear in
> your program before any SimPy process objects are activated."
>
> Any idea why that happens
>

I am guessing it's because now gives you the current clock value. Yes,
initialise sets it to 0.0, but on execution now will change to the time
since initialise(), so you will get varying values. That's my best guess

-- 
./Sven

Thread

Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-18 18:57 -0700
  Re: Problem this random seed() eli m <techgeek201@gmail.com> - 2013-03-18 19:36 -0700
  Re: Problem this random seed() alex23 <wuwei23@gmail.com> - 2013-03-18 19:51 -0700
    Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 03:52 -0700
  Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 03:54 -0700
    Re: Problem this random seed() Sven <svenito@gmail.com> - 2013-03-19 11:59 +0000
      Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 05:27 -0700
      Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 05:27 -0700
      Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 06:50 -0700
        Re: Problem this random seed() Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-19 14:18 +0000
        Re: Problem this random seed() Sven <svenito@gmail.com> - 2013-03-19 14:19 +0000
          Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 07:44 -0700
            Re: Problem this random seed() Sven <svenito@gmail.com> - 2013-03-19 15:05 +0000
            Re: Problem this random seed() Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-19 15:09 +0000
              Re: Problem this random seed() Sven <svenito@gmail.com> - 2013-03-19 15:19 +0000
          Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 07:44 -0700
      Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 06:50 -0700
  Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 07:18 -0700
  Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 08:23 -0700
    Re: Problem this random seed() NZach <nickzacharatos@gmail.com> - 2013-03-19 08:26 -0700

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