getValue method

@override double getValue(num quantile)

Returns the value at the given quantile (between 0 and 1).

Implementation

@override
double getValue(num quantile) {
  if (quantile < 0.0 || quantile > 1.0) {
    throw ArgumentError("$quantile is not in [0..1]");
  }

  if (_values.isEmpty) return 0.0;

  final pos = quantile * (_values.length + 1);

  if (pos < 1) return _values[0].toDouble();
  if (pos >= _values.length) return _values[_values.length - 1].toDouble();

  final lower = _values[pos.toInt() - 1];
  final upper = _values[pos.toInt()];
  return (lower + (pos - pos.floor()) * (upper - lower)).toDouble();
}