private static double[] CalcPairwise(List <Cluster> clusters, Similarity similarity, int startIdx, int endIdx, float[][] cache, int offset)
{
double[] lowestPair = new double[] { 0.0d, 1.0d, Double.MaxValue, 0.0d };
double closest = similarity.GetDistance(clusters[0], clusters[1]);
Int64 cacheMisses = 0;
// loop through every pair looking for the smallest distance
for (int i = startIdx; i < endIdx; i++)
{
for (int j = (i + 1); j < clusters.Count; j++)
{
int row = clusters[i].Id + offset;
int col = clusters[j].Id + offset;
//if (cache[row][col] == -10.0d)
//{
cache[row][col] = (float)similarity.GetDistance(clusters[i], clusters[j]);
cacheMisses++;
//}
double d = cache[row][col];
if (d < closest)
{
closest = d;
lowestPair = new double[] { i, j, closest, 0.0d };
}
}
}
lowestPair[3] = cacheMisses;
return(lowestPair);
}