method evaluate

Source

evaluate(EvaluationType type, ContextModel context) {
  var argEval = arg.evaluate(type, context);

  if (type == EvaluationType.REAL) {
    return Math.log(argEval);
  }

  if (type == EvaluationType.INTERVAL) {
    // Expect argument of type interval
    return new Interval(Math.log(argEval.min), Math.log(argEval.max));
  }

  throw new UnimplementedError('Can not evaluate ln on ${type} yet.');
}