public static IEnumerable <T> BoundBySigmas <T>(this IEnumerable <T> ld, Func <T, double> transform, double minBound, double maxBound)
{
double mean = ld.Average(transform);
double stdev = ld.StandardDeviation(transform);
SigmaBoundingContext context = new SigmaBoundingContext {
Mean = mean, StdDev = stdev, MinBound = minBound, MaxBound = maxBound
};
return(BoundBySigmasIter(ld, transform, context));
}
public static IEnumerable <double> BoundBySigmas(this IEnumerable <double> ld, double minBound, double maxBound, ref object context)
{
if (!ld.Any())
{
return(ld);
}
if (context == null)
{
double mean = ld.Average();
double stdev = ld.StandardDeviation();
context = new SigmaBoundingContext {
Mean = mean, StdDev = stdev, MinBound = minBound, MaxBound = maxBound
};
}
return(BoundBySigmasIter(ld, (SigmaBoundingContext)context));
}
private static IEnumerable <T> BoundBySigmasIter <T>(this IEnumerable <T> ld, Func <T, double> transform, SigmaBoundingContext context)
{
return(ld.Where(item => context.IsValueInBounds(transform(item))));
}
private static IEnumerable <double> BoundBySigmasIter(this IEnumerable <double> ld, SigmaBoundingContext context)
{
return(ld.Where(context.IsValueInBounds));
}
