public double Compare(IVector v1, IVector v2)
{
//v1 = NormalizeOrDefault(v1);
//v2 = NormalizeOrDefault(v2);
Dictionary <IDimensionKey, IDimensionValue> v1Values = v1.DimensionValues.ToDictionary(dv => dv.DimensionKey);
double dotProduct = 0;
double squaredV1Sum = 0;
double squaredV2Sum = 0;
Dictionary <IDimensionKey, IDimensionValue> v1DimensionKeys = v1.DimensionValues.ToDictionary(dv => dv.DimensionKey);
foreach (IDimensionValue v2DimensionValue in v2.DimensionValues)
{
IDimensionValue vDim1Value = v1Values.TryGetValue(v2DimensionValue.DimensionKey, out IDimensionValue v1v) ? v1v : null;
v1DimensionKeys.Remove(v2DimensionValue.DimensionKey);
v1Values.Remove(v2DimensionValue.DimensionKey);
double v1Value = vDim1Value?.Value ?? 0.0;
double v2Value = v2DimensionValue.Value;
AddDimension(v1Value, v2Value, ref dotProduct, ref squaredV1Sum, ref squaredV2Sum);
}
foreach (double v1Value in v1DimensionKeys.Values.Select(dv => dv.Value))
{
const double v2Value = 0.0;
AddDimension(v1Value, v2Value, ref dotProduct, ref squaredV1Sum, ref squaredV2Sum);
}
double v1Length = Math.Sqrt(squaredV1Sum);
double v2Length = Math.Sqrt(squaredV2Sum);
double lengthProduct;
lengthProduct = v1Length * v2Length;
if (double.IsInfinity(lengthProduct))
{
throw new OverflowException();
}
if (lengthProduct == 0)
{
return(0);
}
double frac = dotProduct / lengthProduct;
const double fracTollerance = 0.000000000000001;
if (Math.Abs(frac - 1) < fracTollerance)
{
return(0);
}
double arcCos = Math.Acos(frac);
return(arcCos);
}
private IEnumerable <IDimensionValue> LastDimensions(DateTime?statsLastSuccess, DateTime?statsLastFailure)
{
TimeSpan fiveMinutes = TimeSpan.FromMinutes(5);
TimeSpan oneMinute = TimeSpan.FromMinutes(1);
var last5Dim = LastDimensions(statsLastSuccess, statsLastFailure, fiveMinutes, DimensionNames.FiveMinuteDeltaSinceLastSuccessOrFailure);
var last1Dim = LastDimensions(statsLastSuccess, statsLastFailure, oneMinute, DimensionNames.OneMinuteDeltaSinceLastSuccessOrFailure);
var lastDims = new IDimensionValue[]
{
last5Dim,
last1Dim
};
return(lastDims);
}