Map data from object properties containing arrays to multidimensional format.

I am having trouble figuring out the best way to map the current data to a format that is practical for chart.js.

the chart data is being stored here

$scope.data = [ 
   [week1 data, week2 data], //category1
  ...//category2
]

My current data is grouped by week and each week has data for each categories sales. The last element in each category is an object with values containing its total. I need to figure out a way to dynamically map from my current data to the $scope.data format so that $scope.data will create a new array for the category if it does not exist and append to that array as it goes through the weeks.

via CLR45