/// <summary>
/// Continuous calculation of the average of the underlying data source.
/// </summary>
/// <typeparam name="T"></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>([NotNull] this IObservable <IAggregateChangeSet <T> > source, [NotNull] Func <T, float?> valueSelector, float emptyValue = 0)
{
return(source.Avg(t => valueSelector(t).GetValueOrDefault(), emptyValue));
}
/// <summary>
/// Averages the specified value selector.
/// </summary>
/// <typeparam name="T">The type to average.</typeparam>
/// <param name="source">The source.</param>
/// <param name="valueSelector">The value selector.</param>
/// <param name="emptyValue">The empty value.</param>
/// <returns>An observable of decimals with the averaged values.</returns>
public static IObservable <decimal> Avg <T>(this IObservable <IAggregateChangeSet <T> > source, Func <T, decimal?> valueSelector, decimal emptyValue = 0)
{
return(source.Avg(t => valueSelector(t).GetValueOrDefault(), emptyValue));
}
