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

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Kian 2016-5-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283285-summing-from-control-variable-in-loop-to-end-of-loop-and-from-beginning-of-matrix-to-control-variabl

编辑： Ced 2016-5-9

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.