MATLAB: Addition , subtraction

addition and subtraction

[EDIT: 20110519 14:45 CDT – reformat – WDR]
Hi, I need help in coding the following example.. thanks
S is (mXn) matrix and d is (mX1) array
S(1,:) = [0 0.2 0.3 0.5 0.6 0.7 0.72 0.75 …… 1 ]
for example length(S(1,:)) = odd (lets say 7)
d(1)= S(1,1) + (S(1,3)-S(1,2))+(S(1,5)-S(1,4))+(S(1,7)-S(1,6))
…and so on…
if length(S(1,:)) = even(lets say 8)
d(1)=S(1,1) + (S(1,3)-S(1,2))+(S(1,5)-S(1,4))+(S(1,7)-S(1,6))
i.e. neglect S(1,8)
I want to run this program in a loop for entire S matrix and find the array d

Best Answer

d = Sum(S(:,1:2:end),2) - Sum(S(:,2:2:end-1),2)
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