/// <summary>
/// Initializes a new instance of the <see cref="SolverVariable{T}"/> class.
/// </summary>
/// <param name="state">The state where to find the solution of the variable.</param>
/// <param name="name">The name of the variable.</param>
/// <param name="index">The index of the variable.</param>
/// <param name="unit">The unit of the variable.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="state"/> is <c>null</c>.</exception>
public SolverVariable(ISolverSimulationState <T> state, string name, int index, IUnit unit)
{
_state = state.ThrowIfNull(nameof(state));
Name = name;
_index = index;
Unit = unit;
}
/// <summary>
/// Initializes a new instance of the <see cref="Rules"/> class.
/// </summary>
/// <param name="state">The biasing simulation state.</param>
/// <param name="frequencies">The frequencies that will be evaluated.</param>
public Rules(ISolverSimulationState <double> state, IEnumerable <double> frequencies)
: base(state, state.Comparer)
{
FrequencyParameters = new RuleParameters(frequencies);
}
