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

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?

Answer 1

[Voss]

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

[AluminiumMan]

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]

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