relativeError function

double relativeError (dynamic calculated, dynamic correct)

Returns relative error between calculated and correct. The type of calculated and correct must match and can be any vector, matrix, or quaternion.

Implementation 

double relativeError(dynamic calculated, dynamic correct) {
  if (calculated is num && correct is num) {
    final double diff = (calculated - correct).abs().toDouble();
    return diff / correct;
  }
  // ignore: return_of_invalid_type
  return calculated.relativeError(correct);
}