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

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 !

Тhank you in advance!

Answer 1

[Wan Ji]

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 

[Wan Ji]

In practice, the signal A greater than 0 is too strict if A is rather small, e.g. 1e-16 or eps. Then you can define a tolerance TOL to reach your goal

TOL = 1e-10;
q = A>TOL;

[Krasimir Terziev]

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 !

[Wan Ji]

It‘s my pleasure to help you. ^o^