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Summing parts of an array??

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Kevin
Kevin 2014-7-29
回答： Azzi Abdelmalek 2014-7-29
I have the following lines of code:
D=(8./(TSR.*9)).*(F.*(sin(relative_wind).^2).*(cos(relative_wind)-((TSR_local).*(sin(relative_wind)))).*(sin(relative_wind)+((TSR_local).*(cos(relative_wind)))).*(1-(Cd./Cl).*cot(relative_wind)).*(TSR_local.^2));
Cp=sum(D);
D is a 9x1 array. However I only want to sum the first 8 values in the array. Could anybody please show me how to do this as my current code is summing all 9 values?

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Azzi Abdelmalek
Azzi Abdelmalek 2014-7-29
sum(D(1:8))

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