/// <summary>
/// Filters a sequence of values based on a condition.
/// </summary>
/// <param name="source">A number collection to filter.</param>
/// <param name="condition">The condition.</param>
/// <returns>A number collection that contains elements from the input sequence that satisfy the condition.</returns>
public static IEnumerable <double> Where(this IEnumerable <double> source, DoubleCondition condition)
{
if (condition == null)
{
return(source);
}
return(source.Where(ele => condition.IsMatched(ele)));
}