/// <summary>
/// Averages the specified value selector.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source">The source.</param>
/// <param name="valueSelector">The value selector.</param>
/// <param name="emptyValue">The empty value.</param>
/// <returns></returns>
public static IObservable <double> Avg <T>([NotNull] this IObservable <IAggregateChangeSet <T> > source, [NotNull] Func <T, long> valueSelector, long emptyValue = 0)
{
return(source.AvgCalc(valueSelector,
emptyValue,
(current, item) => new Avg <long>(current.Count + 1, current.Sum + item),
(current, item) => new Avg <long>(current.Count - 1, current.Sum - item),
values => values.Sum / (double)values.Count));
}
/// <summary>
/// Continuous calculation of the average of the underlying data source.
/// </summary>
/// <typeparam name="T">The type to average.</typeparam>
/// <param name="source">The source observable.</param>
/// <param name="valueSelector">The function which returns the value.</param>
/// <param name="emptyValue">The resulting average value when there is no data.</param>
/// <returns>
/// An observable of averages.
/// </returns>
public static IObservable <float> Avg <T>(this IObservable <IAggregateChangeSet <T> > source, Func <T, float> valueSelector, float emptyValue = 0)
{
return(source.AvgCalc(valueSelector, emptyValue, (current, item) => new Avg <float>(current.Count + 1, current.Sum + item), (current, item) => new Avg <float>(current.Count - 1, current.Sum - item), values => values.Sum / values.Count));
}
