How to "keep" a variable for some rows within a for loop

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buhmatlab 2020-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/519852-how-to-keep-a-variable-for-some-rows-within-a-for-loop

评论： Ameer Hamza 2020-4-22

采纳的回答： Ameer Hamza

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Hi,

My problem is the following:

I've created a for-loop in which I calculate SOMETHING(i) for each row (see code below). But I'm not able to keep the variable "SOMETHING" for some rows since i updates this variable in each row.

My goal is not to use the current variable SOMETHING of (i) in each row, I rather wanna calculate c with the same "SOMETHING" for 10 rows.

For example:

In the first 10 rows I would like to use SOMETHING(1) for my calculation of variable c and in row 11 I would like to use

SOMETHING(11) = SOMETHING(1) + c(1) + c(2) + c(3) + c(4) + c(5) + c(6) + c(7) +c(8) + c(9) + c(10)

With SOMETHING(11) I would like to calculate c for the next 10 rows again and so on...

Is there a way to achieve this?

Would I need to use another for loop?

MANY THANKS!!!

WRONG CODE:

for i = length(a)
    c(i) = a(i) + b(i) * SOMEHING(i)
    SOMETHING(i) = c(i) + SOMETHING(i) 
end                                                                                           

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采纳的回答

Ameer Hamza 2020-4-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519852-how-to-keep-a-variable-for-some-rows-within-a-for-loop#answer_427599

编辑：Ameer Hamza 2020-4-22

在 MATLAB Online 中打开

Try something like this

for i = 1:length(a)
    idx = floor((i-1)/10)*10 + 1;
    c(i) = a(i) + b(i) * SOMEHING(idx);
    if mod(i,10)==1
        SOMETHING(idx) = c(idx-9:idx) + SOMETHING(idx);
    end
end