print output correctly

src/main/scala/KMeans.scala

@@ -35,7 +35,7 @@ object KMeans {
       for (j <- 0 until m) {
         centres(i)(j) += i+j
       }
-      println("centre " + i + " = " + centres(i) )
+      println("centre " + i + " = " + centres(i).mkString("[",",","]") )
     }
 
     /*var centres : ArrayBuffer[Float] = new ArrayBuffer[Float](K)
@@ -53,8 +53,9 @@ object KMeans {
 
     for (i <- 0 until iterations) {
       centres = clustering(centres, rowsAsArray, m, K)
-      for (i <- 0 until K) {
-        println("centre " + i + " = " + centres(i) )
+      println("\niteration " + i + " :")
+      for (j <- 0 until K) {
+        println("centre " + j + " = " + centres(j).mkString("[",",","]") )
       }
     }
   }

src/main/scala/Main.scala

@@ -16,6 +16,7 @@ object Main {
   // spark cluster
   val sc = new SparkContext(new SparkConf().setAppName("Spark KMeans Clustering"))
   val sqlContext = new org.apache.spark.sql.SQLContext(sc)
+  sc.setLogLevel("WARN") //reduce spark command line verbosity
 
   import sqlContext.implicits._
 
@@ -29,7 +30,7 @@ object Main {
     // get the users XML file
 
     val users = df("users")
-    val centres = KMeans.train(users, 3)
+    val centres = KMeans.train(users, 6)
     //val centresArray = centres.collect()
     //val unwrap = centresArray.map(x => x._2)
     //unwrap.foreach(println)