Init from given files

examples/js/distances/cosineSimilarity.js

@@ -0,0 +1,39 @@
+/**
+ * Calculate the distances by using the numbers, strings and dates.
+ * @param  {node} source
+ * @param  {node} target
+ * @param  {array} properties - the properties of the nodes.
+ * @return {number}            the distance between source and target nodes.
+ */
+function calculateCosineSimilarity(source, target, properties, normArgs) {
+  var numerator = 0.0;
+
+  // console.log(properties);
+  // Iterate through every column of data
+  for (var i = 0; i < properties.length; i++) {
+    property = properties[i];
+    if (property.toLowerCase() !== "class" && property.toLowerCase() !== "app" && property.toLowerCase() !== "user" && property.toLowerCase() !== "weekday") {
+      var s = source[property],
+        t = target[property];
+
+      numerator += s * t;
+    }
+  }
+
+  let denominator = squareRooted(source, properties, normArgs) * squareRooted(target, properties, normArgs);
+
+  // console.log(Math.abs(numerator / denominator));
+  return Math.abs(numerator / denominator);
+}
+
+function squareRooted(node, properties, normArgs) {
+  var sum = 0.0;
+
+  for (var i = 0, s; i < properties.length; i++) {
+    var s = node[properties[i]];
+
+    sum += s * s;
+  }
+
+  return Math.sqrt(sum);
+}