Changed minimum expected number of clusters for k-means

Author: mpraski

errors.go

@@ -6,5 +6,5 @@ var (
 	ErrEmptySet       = errors.New("Empty training set")
 	ErrNotTrained     = errors.New("You need to train the algorithm first")
 	ErrZeroIterations = errors.New("Number of iterations cannot be less than 1")
-	ErrZeroClusters   = errors.New("Number of clusters cannot be less than 1")
+	ErrOneCluster     = errors.New("Number of clusters cannot be less than 2")
 )

kmeans.go

@@ -54,8 +54,8 @@ func KmeansClusterer(iterations, clusters int, distance DistanceFunc, online ...
 		return nil, ErrZeroIterations
 	}
 
-	if clusters < 1 {
-		return nil, ErrZeroClusters
+	if clusters < 2 {
+		return nil, ErrOneCluster
 	}
 
 	var d DistanceFunc