Merge pull request #35 from IDisposable/patch-1

Move mean calculation out of loop
simogeo · Oct 31, 2016 · 7dddc89 · 7dddc89
2 parents 42639e0 + 5f3c060
commit 7dddc89
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/lib/geostats.js b/lib/geostats.js
@@ -367,12 +367,12 @@ var geostats = function(a) {
 
 		if (this.stat_variance  == null) {
 
-			var tmp = 0;
+			var tmp = 0, serie_mean = this.mean();
 			for (var i = 0; i < this.pop(); i++) {
-				tmp += Math.pow( (this.serie[i] - this.mean()), 2 );
+				tmp += Math.pow( (this.serie[i] - serie_mean), 2 );
 			}
 
-			this.stat_variance =  tmp /	this.pop();
+			this.stat_variance =  tmp / this.pop();
 
 			if(round == true) {
 				this.stat_variance = Math.round(this.stat_variance * Math.pow(10,this.roundlength) )/ Math.pow(10,this.roundlength);