Issues with sampling input data and finding the difference

Hello, I am trying to implement this section of the article, however i seem not to be geeting reasonable answer. Attaced is the doument and my code

function [y,X,SI] = fcn(Vo,Io,dVo,dIo,t) % The variable dvo/dIo is same as Vo/Io just passed through a zero order hold
Vpre = 0;
Ipre = 0;
Vpost = dVo;
Ipost = dIo;
if t > 2 && t <= 2.05 % Time of Islanding
    Vpre = Vo;
    Ipre = Io;
end
SI = abs((Vpost/Ipost)-(Vpre/Ipre));
CSOSI = cumsum(SI);
X = CSOSI;
y =[Vpost Ipost Vpre Ipre];

[VBBV]

you need to add one more condition for CSOSI after calculating it.

if CSOSI > K  % K is the threshold value for your model 
    break;
else
    continue;
end 

[chizom wornu]

Already did that aspect. My problem is i want to eliminate the clock (t). I just want to detect when my signal starts falling. And wait for this condition to occur

if CSOSI > K  % K is the threshold value for your model 
    break;
else
    continue;
end