Re: [Swarm-Support] Swarm time

[Paul E. Johnson]

Look at the order of schedules in your activateIn statements.  The order 
in which classes are activated determines the order in which they are 
told to do things at each timestep.

I recall an example where there were 3 classes, activated like

- activateIn: swarmContext
{
     [super activateIn: swarmContext];
    [modelSchedule1 activateIn: self];
    [modelSchedule2 activateIn: self];
 return [self getActivity];
}

If, by some quirk, your simulation is written so that objects who step 
in modelSchedudule1 happen to depend on things being finished from 
modelSchedule2, then it may appear that the modelSchedule1 is not doing 
anything at time 0. Then, at time 1, the modelSchedule2 things were done 
on the previous iteration, and then those things exist and the objects 
triggered by modelSchedule1 can find them and make some calculations. 
So to correct that problem, either some redesign was necessary, or we 
changed the method to



- activateIn: swarmContext
{
     [super activateIn: swarmContext];
    [modelSchedule2 activateIn: self];
    [modelSchedule1 activateIn: self];
 return [self getActivity];
}

Its funny, but when that problem arose, I remember thinking it was such 
an unusual quirk that I would never forget it.  Now I can't even 
remember what program it came up in!

Good Luck

PJ



Li An wrote:

> Hi Swarm folks,
>
> I have a question with how Swarm counts the current time. As you know, 
> you can get the time by using Globals.env.getCurrentTime(). If I set 
> the simulation length to be 2 years, the program reports three times:
>
> at year 0:....
> at year 1, ...
> at year 2, ...
>
> Some of the results are not calculated at year 0, indicating the 
> associated processes are not implemented, but some are.
>
> What could be the problem?
>
> Thanks,
>
> Li
> Li An
> Department of Fisheries and Wildlife
> 13 Natural Resources Building



--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
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