Problem this random seed()

Sven svenito at gmail.com
Tue Mar 19 15:19:10 CET 2013


On 19 March 2013 13:50, NZach <nickzacharatos at gmail.com> wrote:

> Sorry, my previous reply was completely wrong. The time is initialized
> through the initialize() to 0. So, each time i call main() the simulation
> time is initialized to 0.
>
> I changed the code in order to print and check the values of
>
> G.Rnd.expovariate(MachineClass.SrvRate) and
> G.Rnd.expovariate(ArrivalClass.ArvRate)
>
> here is the code and the changes i made :
> http://codeviewer.org/view/code:30d8
>
> The values are not the same.
>
> The result i take is the following:
>
> Result from main() call No. 1 is 0.0452927906737
> Result from main() call No. 2 is 0.0588336669949
> 2
> First time Execution of Main Main
> [0.07267291894782457, 0.019146562687989536, 0.034780398625615376,
> 0.005528912370370478, 0.023636815811338075]
> [0.13472907136407936, 0.0025553071735785462, 0.08868344131130483,
> 0.05381286556098766, 0.044091180681591464]
> Second time Execution of Main
> [0.0335704752213292, 0.1321512230812724, 0.16025979406301488,
> 0.029210377271523574, 0.006680846943670858]
> [0.20642889529587374, 0.047894131266223446, 0.10958802111803392,
> 0.02393344456847461, 0.13280785022932287]
>

In the new code you are creating one instance of G which you seed with 1234
and then calling  expovariate on it each time you call main without
reseeding. You're only seeding it once and reusing it, so you would get
different values. What you had before, where you seeded G.Rnd in the main
was fine.

I also suggest you change one thing at a time, rather than reworking large
parts each iteration. All I was suggesting was a simple print statement in
the Run method like you had it before


-- 
./Sven
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