Export variable from init to global ?

[Patrick Giraudoux]

Hi,

Following https://groups.google.com/forum/#!topic/gama-platform/vEKH0wIFFWA, in the init section I have created a list of cells as following:

create zoneFav from:zonefavorable;
zoneFav la_zone_fav <- one_of(zoneFav);
list<cellPred> mySel<-cellPred overlapping(la_zone_fav);

I would like to use mySel elsewhere in species behaviour. For instance, I want to define the cell destination of each agent of the species pred in av reflex 'move1' as following:

list<cellPred> dest1<-my_cellPred neighbours_at predMov where((each.nb_ater>my_cellPred.nb_ater) and empty(each.agents)); // list of cells with 'expected conditions'
list<cellPred> dest2<-mySel inter dest1; //intersection between the list of cells overllaping zoneFav and the list of cells meeting the expected conditions
cellPred dest <- one_of(dest2); // selection of one of those cells

However, mySel although declared in init (hence global)  looks like not being accessible from a reflex inside a species:"The variable mySel is not defined or accessible in this context. Check its name or declare it". In other words is there a way to export mySel to global from the init section or another way to make it global?

Any hint appreciated,

Thanks in advance,

Patrick

[Srirama Bhamidipati]

Hi 

I am working on something of a similar problem. :( , you ask the question at the right time :) I shall wait for GAMA team's response. Meanwhile.....

From the help manual I gather, that init values are valid only to start the simulation whether it is init in global, or init in species. Currently to make them accessible, I assign init variables to a species variable or a global variable before I leave the init { } . So far it is working for me. ( I think so ) Hope it helps you.

regards,

Srirama

[Alexis Drogoul]

Hi,

If you need to reuse mySel somewhere else in a species (or in your model), the best is to declare it as an attribute of global. Something like:

global {
…
list<cellPred> mySel;
…

init {
…
mySel<-cellPred overlapping(la_zone_fav);
…
}
….
}

Cheers
Alexis

Le 6 août 2014 à 15:05, Patrick Giraudoux <patrick....@univ-fcomte.fr> a écrit :

> Hi,
>
> Following https://groups.google.com/forum/#!topic/gama-platform/vEKH0wIFFWA, in the init section I have created a list of cells as following:
>
> create zoneFav from:zonefavorable;
> zoneFav la_zone_fav <- one_of(zoneFav);
> list<cellPred> mySel<-cellPred overlapping(la_zone_fav);
>
> I would like to use mySel elsewhere in species behaviour. For instance, I want to define the cell destination of each agent of the species pred in av reflex 'move1' as following:
>
> list<cellPred> dest1<-my_cellPred neighbours_at predMov where((each.nb_ater>my_cellPred.nb_ater) and empty(each.agents)); // list of cells with 'expected conditions'
> list<cellPred> dest2<-mySel inter dest1; //intersection between the list of cells overllaping zoneFav and the list of cells meeting the expected conditions
> cellPred dest <- one_of(dest2); // selection of one of those cells
>
> However, mySel although declared in init (hence global) looks like not being accessible from a reflex inside a species:"The variable mySel is not defined or accessible in this context. Check its name or declare it"
>

> Any hint?
>
> Thanks in advance,
>
> Patrick
>
>
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--
Senior Researcher, UMI UMMISCO 209, IRD & UPMC, France.
Invited Researcher, DREAM, Can Tho University, Viet Nam.
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[Vietnam] +84915088155 [France] +33608698845
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GAMA: https://code.google.com/p/gama-platform/

[HUYNH Nghi]

Hi,

As my opinion, you are using a <<let>> which declare a temporary variable in a block of statement ( in this case : block init), it;s not a permanent attribute of a species ( user-defined species, world). So it can access only in where it declare, because it will be destroy after execution of this block.

Cheers.

HUYNH Nghi

[Vietnam] +84909128322
GAMA: https://code.google.com/p/gama-platform/

--

[Patrick Giraudoux]

Many thanks everybody for your suggestions.

A posteriori, Alexis' solution should have been obvious to me (ashes on my head ! This is basic programming - even for an humble ecologist newbie). Declare it in global, update it anywhere else (or so...).

Cheers,

Patrick