changing loop index within the loop

Hello, please how can I write a loop that its index value changes within the loop. The function below, receive inputs of arrival time of some packets. The function monitors the system inactivity (i.e time when there is no arrival). if there is arrival, it reset the timer and set a variable u to be active otherwise if after a certain consecutive inactivity the function should set u to inactive and exit.

function [s,u] = Active(simTime, pArrival)

 inactivityTimer=1;                                 % initializing timer
 inactivityThreshold=4;                             % initializing timer threshold
 
 for v=inactivityTimer:inactivityThreshold          %loop for monitoring the arrival
    u='active';
     if pArrival(simTime)==1                        % checking for arrival in the array which contains random bits
          inactivityTimer=0;                        % Resetting the time when there is arrival
         simTime=simTime+1;                         % inreamenting the simulation time
         
         
     elseif inactivityTimer>inactivityThreshold     % checking if the timer reaches exceeds threshold
         break;
     else
         inactivityTimer=inactivityTimer+1;         % incrementing simulation time
         simTime=simTime+1;
         
     end
     
 end
   
    if inactivityTimer>inactivityThreshold
        u='inactive';                                 % Setting u to be inactive
    end
    s=simTime;                                        % Assigning simtime to output variable
    
         
 end

Answer 1

[James Tursa]

If you need to modify the loop index within the loop, use a while-loop instead of a for-loop.

[Zaharadeen Yusuf]

Ok I will try