Summing from control variable in loop to end of loop and from beginning of matrix to control variable

As a part of a bigger script, I have a matrix 1738 * 2 (1738 rows - 2 columns) and I want to loop through the first column (so 1738 times). Dependent on the iteration of the loop I would like to sum up the the second column from the start value to the (control variable - 1) and from the control variable to the end of the second column. This is how i try to start with the loop through the first column - COG_Ton is the 1738 x 2 Matrix (although this is also variable on the input data).

for ik = COG_Ton (:,1)

tonnes(ik) = sum (COG_Ton (1:ik-1, 2))

tonnes2(ik) = sum(COG_Ton (ik:end,2))

end;

Unfortunately, I dont know how to write this in Matlab. Advice is warmly welcome.

[Ced]

Hi

ik is a loop variable, i.e. the index you are looping through. Unless COG_Ton(:,1) happens to be 1:1738, this is not what you want.

Have a loop at the documentation for for loops and if statements