updating readme (and demo) #11

README.md

@@ -55,7 +55,7 @@ foreach ($clusters as $num => $cluster) {
         $num,
         $coordinates[0],
         $coordinates[1],
-        count($cluster->getPoints())
+        count($cluster)
     );
 }
 ```

demo.php

@@ -0,0 +1,40 @@
+<?php
+
+require "vendor/autoload.php";
+
+// prepare 50 points of 2D space to be clustered
+$points = [
+    [80,55],[86,59],[19,85],[41,47],[57,58],
+    [76,22],[94,60],[13,93],[90,48],[52,54],
+    [62,46],[88,44],[85,24],[63,14],[51,40],
+    [75,31],[86,62],[81,95],[47,22],[43,95],
+    [71,19],[17,65],[69,21],[59,60],[59,12],
+    [15,22],[49,93],[56,35],[18,20],[39,59],
+    [50,15],[81,36],[67,62],[32,15],[75,65],
+    [10,47],[75,18],[13,45],[30,62],[95,79],
+    [64,11],[92,14],[94,49],[39,13],[60,68],
+    [62,10],[74,44],[37,42],[97,60],[47,73],
+];
+
+// create a 2-dimentions space
+$space = new KMeans\Space(2);
+
+// add points to space
+foreach ($points as $i => $coordinates) {
+    $space->addPoint($coordinates);
+}
+
+// cluster these 50 points in 3 clusters
+$clusters = $space->solve(3);
+
+// display the cluster centers and attached points
+foreach ($clusters as $num => $cluster) {
+    $coordinates = $cluster->getCoordinates();
+    printf(
+        "Cluster %s [%d,%d]: %d points\n",
+        $num,
+        $coordinates[0],
+        $coordinates[1],
+        count($cluster)
+    );
+}