Hi Junjie,
You can calculate with in a loop so that each time you have no need to put a long calculation in dataPoints. Here is a example can help you http://jsfiddle.net/anjalij/QDkdH/2/
Please let me know if either it is works for you or if you face any problem.
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This reply was modified 10 years, 3 months ago by Anjali.