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Jason is a programming language to develop BDI/cognitive agents

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package jason.functions;

import jason.JasonException;
import jason.asSemantics.DefaultArithFunction;
import jason.asSemantics.TransitionSystem;
import jason.asSyntax.ListTerm;
import jason.asSyntax.NumberTerm;
import jason.asSyntax.Term;

/**
@deprecated use function mean instead
*/
@Deprecated
public class Average extends DefaultArithFunction  {

    public String getName() {
        return "math.average";
    }

    @Override
    public double evaluate(TransitionSystem ts, Term[] args) throws Exception {
        if (args[0].isList()) {
            double sum = 0;
            int    n = 0;
            for (Term t: (ListTerm)args[0])
                if (t.isNumeric()) {
                    sum += ((NumberTerm)t).solve();
                    n++;
                }
            return sum  / n;
        }
        throw new JasonException(getName()+" is not implemented for type '"+args[0]+"'.");
    }

    @Override
    public boolean checkArity(int a) {
        return a == 1;
    }
}