How to calculate the whole time that my signal values is more than zero?

Question

Krasimir Terziev 2021-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/1436242-how-to-calculate-the-whole-time-that-my-signal-values-is-more-than-zero

评论： Wan Ji 2021-8-19

采纳的回答： Wan Ji

1.jpg

Hello,

I'm stuck in the middle of my model and im wondering how i can do one simple calculation.

On the picture below u can see my signal.

I try to find out how much time the signal is greather than zero? Im tring to do it with simulink blocks.

Can anyone help me with this? I will be very thankful !

Т

hank you in advance!

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Answer 1

Wan Ji 2021-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/1436242-how-to-calculate-the-whole-time-that-my-signal-values-is-more-than-zero#answer_769737

编辑：Wan Ji 2021-8-18

在 MATLAB Online 中打开

If your signal array is A, and with a time array t the same size as A.

The total time the signal is greater than zero will be

A = A(:); t = t(:);
q = A>0;
dt =[0;diff(t)];
t_positive = sum(dt(q)) % total time the signal is greater than zero 

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Krasimir Terziev 2021-8-18

编辑：Krasimir Terziev 2021-8-19

Hello,

Thanks for the fast answer. Тhis is not exactly what I was looking for but the code working fine when i take the scope data into the workspace. (btw the A array and t array are aways the same - they are the x and y in scope block).

I find what im missing.

1st my model is a phasor with max step size to 5 and simulation time to 24*60*60*7 (7 days).

in that case when i put my signal into enable subsystem with specific structure inside(shown in the picture below) its going well BUT instead of const = 1, it have to be the same as the max step size. So the const = 5 now and it calc. as the same your code above! Now nometter the what max step size i use, its the same answer!!!

Thank you very much for helping me !