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Model Parametrization [message #653643]

Thu, 10 February 2011 14:18

Lukas Schmid

Messages: 3
Registered: December 2010

Junior Member

hello,

we have just been wondering how we can define Attributes in the model parametrization file which belong to an agent (and not to the global model).

http://wiki.globalsimulate.org//images/ParameterfileBug.png

Thanks for any reply!

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Re: Model Parametrization [message #653685 is a reply to message #653643]

Thu, 10 February 2011 17:29

Miles Parker

Messages: 1341
Registered: July 2009

Senior Member

Hi,

It probably doesn't make sense to assign parameters to agents at the parameter file level -- that's because there is a one-to-one relationship with the parameter file and the top-level model. What you should do is something like:

1. Create an attribute at the top model context called "Bug Size" or perhaps "Default Bug Size" if you want bugs to be different sizes.
2. In an initialization rule for the bug assign that default value to the bug's size attribute

For an impossibly technical and meandering discussion of some of the deeper issues of assigning initial state for nested parameters, you might be interested in this:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=318274

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Re: Model Parametrization [message #653774 is a reply to message #653685]

Fri, 11 February 2011 06:18

Lukas Schmid

Messages: 3
Registered: December 2010

Junior Member

Hi Miles,

thanks for your reply - we will do it this way!

Lukas

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Re: Model Parametrization [message #653902 is a reply to message #653774]

Fri, 11 February 2011 18:34

Miles Parker

Messages: 1341
Registered: July 2009

Senior Member

lukschmi wrote on Fri, 11 February 2011 01:18

Hi thanks for your reply - we will do it this way!

No problem! After I replied to you, I remembered a thought I had for what might actually be a cool/useful feature -- and perhaps be simpler than the other solutions discussed in the above referenced bug. We could consider supporting some kind of XPath like assignment of variables. This would be directly supported by EMF, so wouldn't be incredibly difficult to implement. Then you could do something like:

Bug[*].size=0

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