angularjs - Ng-grid and sorting array data -

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i'm using ng-grid data source array of arrays so

 $scope.mydata = [       ["moroni", "m"],       ["tiancum", "t"],       ["jacob", "j"],       ["nephi", "n"],       ["enos", "e"]     ]

the full example can found on plunker http://plnkr.co/edit/lk6rnzagheeohmmkb1ri?p=preview

the actual problem data not sort while user clicks column headers. expected behaviour? there way data sort when click column?

thanks


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