/**

 * It can sometimes be useful to get the average of data in an API result set,

 * be it from a column, or a collection of cells. This method provides exactly

 * that ability.

 *

 *  @name average()

 *  @summary Average the values in a data set.

 *  @author [Allan Jardine](http://sprymedia.co.uk)

 *  @requires DataTables 1.10+

 *

 * @returns {Number} Calculated average

 *

 *  @example

 *    // Average a column

 *    var table = $('#example').DataTable();

 *    table.column( 3 ).data().average();

 *

 *  @example

 *    // Average two cells

 *    var table = $('#example').DataTable();

 *    table.cells( 0, [3,4] ).data().average();

 */



jQuery.fn.dataTable.Api.register( 'average()', function () {

    var data = this.flatten();

    var sum = data.reduce( function ( a, b ) {

        return (a*1) + (b*1); // cast values in-case they are strings

    } );

 

    return sum / data.length;

} );



