How to make a loop end when you reach the end of some data

Question

AluminiumMan 2024-3-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2090696-how-to-make-a-loop-end-when-you-reach-the-end-of-some-data

编辑： Voss 2024-3-6

I wish to implement a counter in MATLAB. The loop will increase a counter evertime some conditions are met.

I wish for the loop to cycle through each sample point in the data and then end when the loop has cycled through all data points in the variable.

How would I implement this?

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Answer 1

Voss 2024-3-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2090696-how-to-make-a-loop-end-when-you-reach-the-end-of-some-data#answer_1421466

在 MATLAB Online 中打开

counter = 0;
for ii = 1:numel(data)
    if condition
        counter = counter+1;
    end
end

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AluminiumMan 2024-3-6

Thank you. What does the ii do? Is that a variable I need to declare?

Also I only want the counter to go up once each time the data reaches 0, and then I dont want the counter to be able to increase again until the data goes above 100 and then drops to zero again

Voss 2024-3-6

编辑：Voss 2024-3-6

在 MATLAB Online 中打开

You're welcome!

"What does the ii do?"

ii is the index variable of the for-loop.

https://www.mathworks.com/help/matlab/matlab_prog/loop-control-statements.html

"Is that a variable I need to declare?"

It is defined in the for statement. That's all you need to do to declare ii.

"Also I only want the counter to go up once each time the data reaches 0, and then I dont want the counter to be able to increase again until the data goes above 100 and then drops to zero again"

Maybe something like this then:

counter = 0;
data_hit_100 = false;
for ii = 1:numel(data)
    if data(ii) >= 100
        data_hit_100 = true;
    end
    if data_hit_100 && data(ii) <= 0
        counter = counter+1;
        data_hit_100 = false;
    end
end