/// <summary>
/// Logarithm of all intervals multiplied.
/// </summary>
/// <param name="chain">
/// Source sequence.
/// </param>
/// <param name="link">
/// Link of intervals in chain.
/// </param>
/// <returns>
/// <see cref="double"/> value of alphabetic average remoteness.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Thrown if method is called not from <see cref="Calculate(Chain,Link)"/> and alphabet cardinality is unknown.
/// </exception>
/// <exception cref="ArgumentException">
/// Thrown if link is unknown.
/// </exception>
private double Calculate(CongenericChain chain, Link link)
{
int[] intervals = chain.GetIntervals(link);
return intervals.Length == 0 ? 0 : intervals.Sum(interval => Math.Log(interval, alphabetCardinality));
}
/// <summary>
/// Calculated as product of all intervals in sequence.
/// </summary>
/// <param name="chain">
/// Source sequence.
/// </param>
/// <param name="link">
/// Redundant parameter, not used in calculations.
/// </param>
/// <returns>
/// Volume characteristic of chain as <see cref="double"/>.
/// </returns>
public double Calculate(CongenericChain chain, Link link)
{
var intervals = chain.GetIntervals(link);
return intervals.Length == 0 ? 1 : intervals.Aggregate((result, interval) => result * interval);
}
/// <summary>
/// Calculated as base 2 logarithm of multiplication
/// of intervals between nearest elements
/// in congeneric sequence.
/// </summary>
/// <param name="chain">
/// Congeneric sequence.
/// </param>
/// <param name="link">
/// Link of intervals in chain.
/// </param>
/// <returns>
/// <see cref="double"/> value of depth.
/// </returns>
public double Calculate(CongenericChain chain, Link link)
{
var intervals = chain.GetIntervals(link);
return intervals.Length == 0 ? 0 : intervals.Sum(interval => Math.Log(interval, 2));
}
/// <summary>
/// If link is to start, to end or cycle then intervals count equals elements count.
/// If link is to start and end then intervals count equals elements count + 1.
/// If link is none then intervals count equals elements count - 1.
/// </summary>
/// <param name="chain">
/// Source sequence.
/// </param>
/// <param name="link">
/// Link of intervals in chain.
/// </param>
/// <returns>
/// Intervals count in chain as <see cref="double"/>.
/// </returns>
public double Calculate(CongenericChain chain, Link link)
{
return chain.GetIntervals(link).Length;
}
