private static Double Euclidean(IMathPoint p, IMathPoint c)
{
DataMiningMath.MetricEquals(p, c);
Double result = 0;
for (Int32 i = 0; i < c.CoordinatesCount; i++)
{
result += (p[i] - c[i]) * (p[i] - c[i]);
}
return(result);
}
private static Double Cityblock(IMathPoint p, IMathPoint c)
{
DataMiningMath.MetricEquals(p, c);
Double result = 0;
for (Int32 i = 0; i < c.CoordinatesCount; i++)
{
result += p[i] < c[i] ? c[i] - p[i] : p[i] - c[i];
}
return(result);
}
internal static IMathPoint MeanPoint(IMathPoint p, IMathPoint c)
{
DataMiningMath.MetricEquals(p, c);
IMathPoint meanPoint = c.Clone() as IMathPoint;
for (Int32 i = 0; i < c.CoordinatesCount; i++)
{
meanPoint[i] = 0.5 * (p[i] + c[i]);
}
return(meanPoint);
}
private static Double Cosine(IMathPoint p, IMathPoint c)
{
DataMiningMath.MetricEquals(p, c);
Double pc = 0, pp = 0, cc = 0;
for (Int32 i = 0; i < c.CoordinatesCount; i++)
{
pc += p[i] * c[i];
pp += p[i] * p[i];
cc += c[i] * c[i];
}
return(1 - (pc / System.Math.Sqrt(pp * cc)));
}