Adding the first n elements of an array

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John Slugg
John Slugg 2020-4-29
回答： Geoff Hayes 2020-4-29
I am trying to add the first n elements of my array as I go through this loop. Right now I am using lt{k}*k to achieve this addition, however this only works when lt{k} is equal in all entries. for the problem I am trying to solve, the entries are varried.
lt={0.020 0.005 0.020 0.005 0.020};
so I want the value for each iteration to be:
0.020
0.025
0.045
0.050
0.070
this line of code will be used to replace lt{k}*k
zk = cell(n,1);
zk_1 = cell(n,1);
for k = 1:n
zk{k} = (lt{k}*k-(Lt/2));
zk_1{k} = (lt{k}*(k-1)-(Lt/2));
end

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回答（1 个）

Geoff Hayes
Geoff Hayes 2020-4-29
John - given your output, it sounds like you are trying to get the code to do a cumulative sum. If you need to use a for loop, then your calculations need to depend upon the previous iteration.
n = length(lt);
zk = cell(n,1);
zk{1} = lt{1};
for k = 2:n
zk{k} = lt{k} + zk{k-1}; % <--- use previous iteration sum at zk{k-1}
end
Or just use cumsum.

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