try {
if (getOperator(this.getEntity()) == PRODUCTO) {
ret = ret.producto(((Expression) expr[1]).evaluateExpression(
row));
} else if (getOperator(this.getEntity()) == DIVISION) {
ret = ret.producto(((Expression) expr[1]).evaluateExpression(
row).inversa());
}
} catch (IncompatibleTypesException e) {
throw new EvaluationException(e);
}