[Repast-interest] Data Source instantiation

[bagjohn <bag...@gm...>]

I am trying to build a custom dataset. I need to define my datasources.
I need to call functions that return not only single values from agents but
also double[] arrays which I want then to process. The dataset editor does
not let me do that.

I ve seen  previous  posts
<http://repast.10935.n7.nabble.com/Data-collection-without-GUI-wizard-td3051.html>  
mentioning the problem and tried to do what is mentioned in  one of them
<http://repast.10935.n7.nabble.com/Custom-Data-Source-Help-Repast-Smphony-2-1-td10373.html#a10376>  
: implement AggregateDataSource in my main agent class, where I want to
retrieve data from.

But I guess I don't do it right, because after I put my class name to the
custom dataset editor line and press ADD i get (The class is not
instantiated).

So just to be sure:
Let's say i have a class of agents Mouse.class (e.g. n is the number of
mouses in the simulation in the current tick) and want to get a double[m]
array from each one of them at every tick (m the dimension of the array
retrieved from each agent), perform some operation on the complete
double[n][m] array that represents the population of agents at every tick
and return a double[m] array for the current tick. Do that for subsequent
ticks and watch that array's evolution through time.

So i have :
public class Mouse implements AggregateDataSource 

And the interface methods are automatically created. Here is what I did on
them :

@Override
	public String getId() {
		// I just made up an id. Do I have to put something specific here?
		return "Mouse";
	}

	@Override
	public Class<?> getDataType() {
		// I just return the datatype i will retrieve from each agent. Correct ?
		return double[].class;
	}

	@Override
	public Class<?> getSourceType() {
		// I just return the class this method is in, which is the same as the one
from which the data will be retrieved.
		return Mouse.class;
	}
	
	
	@Override
	public double[] get(Iterable<?> context, int size) {
		// I do not really understand what to do here. My iterable will be the
current context which i will scan for objects of type Mouse
		context = ContextUtils.getContext(this);
		List<double[]> Synapse_strengths_list = new ArrayList<double[]>();
		while(context.iterator().hasNext()) {
			if (context.iterator().next() instanceof Mouse){
				Object mouse = context.iterator().next();
				Synapse_strengths_list.add(((Mouse) mouse).getSynapse_strength());
	        }
	      }
		double[][] Synapse_strengths = new double[
Synapse_strengths_list.size()][];
		Synapse_strengths_list.toArray(Synapse_strengths);
		
		double[] mean_synapse_strengths = new double[Synapse_strengths[0].length];
		for (int j=0; j<Synapse_strengths[0].length; j++) {
			double sum = 0;
			for (int i=0; i<Synapse_strengths.length; i++){
				sum = sum + Synapse_strengths[i][j];
			}
			mean_synapse_strengths[j] = sum / Synapse_strengths.length;
		}
			
		
		return mean_synapse_strengths;
	}

	@Override
	public void reset() {
		// Do I do something here?
		
	}

I guess my problem is this:
Who calls these methods? What arguments should I put?
And is it right to implement the AggregateDataSource on the agent class?

Thank you

Panos



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