private static double ApplyJenks(ref List <double> refList)
{
int[] groupCorrection = { 1, 1, 1, 2, 4, 7, 9, 10, 10, 10 };
// Check if the speed list is empty.
if (refList.Count == 0)
{
throw new InvalidOperationException("Empty list");
}
var corr = NaturalBreaks.CreateNaturalBreaksArray(refList, 10);
var groupList = new List <int>(refList.Count);
foreach (var cur in refList)
{
for (var j = 1; j < corr.Count + 1; j++)
{
if (j == corr.Count || cur < corr[j])
{
groupList.Add(j - 1);
break;
}
}
}
var jenksVar = refList.Select((t, i) => t * groupCorrection[groupList[i]]).Sum();
var GroupCount = 0;
for (var i = 0; i < 10; i++)
{
GroupCount += groupList.Count(x => x == i) * groupCorrection[i];
}
return(jenksVar / GroupCount);
}
