API: average() and sum() methods for DT1.10

api/average().js

@@ -0,0 +1,20 @@
+/**
+ * Average the values in a data set.
+ *  @name average()
+ *  @author [Allan Jardine](http://sprymedia.co.uk)
+ *  @requires DataTables 1.10+
+ *
+ *  @example
+ *    table.column( 3 ).data().average();
+ */
+
+jQuery.fn.dataTable.Api.register( 'average()', function () {
+	var i=0;
+	var sum = this.flatten().reduce( function ( a, b ) {
+		i++;
+		return (a*1) + (b*1); // cast values in-case they are strings
+	} );
+
+	return sum / i;
+} );
+

api/sum().js

@@ -0,0 +1,17 @@
+/**
+ * Sum the values in a data set.
+ *  @name sum()
+ *  @anchor sum()
+ *  @author <a href="http://sprymedia.co.uk">Allan Jardine</a>
+ *  @requires DataTables 1.10+
+ *
+ *  @example
+ *    table.column( 3 ).data().sum();
+ */
+
+jQuery.fn.dataTable.Api.register( 'sum()', function () {
+	return this.flatten().reduce( function ( a, b ) {
+		return (a*1) + (b*1); // cast values in-case they are strings
+	} );
+} );
+