Here i am attaching the picture you reference. S1,S2 and S3 are the three different segments of the curve. i want to calculate the specific area of these segments by using some software like origin or excel.
Do you have the function that generates that curve? If you do, then the following can help you to integrate using integral approximation techniques:
http://www.instructables.com/id/Spreadsheet-Calculus-Derivatives-and-Integrals/
If you don't have the function you could use the same logic to approximate it if you could sample the points along the way.
Thanks Matthew P. Dube for your answer
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