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Average in a summation

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Omar
Omar 2014-2-11
编辑： Azzi Abdelmalek 2014-2-11
Say I have an Excel File with X and Y columns.
How can I compile a program to do the (average between 2, X terms) times (the difference between the 2, Y terms) for n number of terms in consecutive order.
I tried Sum([X(1:end-1) + X(2:end)]/2.* (y(2:end)-Y(1:end))) for some reason the actual value was half the amount from what I got so I'm not sure if I made and error in my coding.

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-11
编辑：Azzi Abdelmalek 2014-2-11
You did 2 errors
X=rand(10,1);
Y=rand(10,1);
sum((X(1:end-1)+X(2:end))/2.*(Y(2:end)-Y(1:end-1)))
sum instead of Sum
Y(2:end)-Y(1:end) is not correct (different sizes)

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