How to filter 2D array in Flex and perform computation based on Filtering

I have an array as follows:
Asia     India   Calcutta 100 200
Asia     India   Chennai 200 400
Asia     India   Mumbai   100 300
Asia     PAK     XXXXXX   100 300
Asia     PAK     SSSSSS   200 100
Americas Canada Ottawa   200 200
Americas Canada Toronto 120 200
Americas Mexico Sonoro   110 500
I need to filter the above dataset also calculating the sum of each region by the use of a specific filter such as a region name is given.(eg. Asia)
Output for filter Asia must give me :
India   400 900
PAK     300 400
How is this possible in Flex array 2D.

Use the example array as the input to a function and create the second array as the output.
Loop through the first array finding the unique country names for the filter region, then for each country name, sum entries for that country, then add a row for the country to the output array.

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How to filter 2D array in Flex and perform computation based on Filtering

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