How to sum from a particular cell to last cell in a single row.

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Hokkien 2021-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/781788-how-to-sum-from-a-particular-cell-to-last-cell-in-a-single-row

评论： Hokkien 2021-3-24

采纳的回答： DGM

Hi all! I wish to sum from particular cell to last cell in a single row. Example:

I have a row A with values = [1 5 7 1 3 4 5 12 2 4]

And I want to sum cell 2 to last cell, cell 6 to last cell, and cell 9 to last cell.

I wish to have something like for loop with customize value so I can get the value of:

cell 2 to last cell = [5+7+1+3+4+5+12+4] = 41

cell 6 to last cell = [4+5+12+2+4] = 27

cell 9 to last cell = [2+4] = 6

I tried to use something like i=length(A):10, but it doesn't and I don't think it is correct as well.

Thanks for the help and I really appreciate it!

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Answer 1

DGM 2021-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/781788-how-to-sum-from-a-particular-cell-to-last-cell-in-a-single-row#answer_656373

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When indexing, you can use the 'end' keyword.

% this is the row vector
A=[1 5 7 1 3 4 5 12 2 4];
% pick a start index
% for demonstration, i'm picking a random one
start=randi(length(A),1);
% you can do this by indexing using the 'end' keyword
sumtoend=sum(A(start:end));
% or you could do it by knowing the vector length
% sumtoend=sum(A(start:length(A)));
% show the results
[start sumtoend]