if i have a counter how would i specify that every time the counter goes up in increments of 1 to execute a command ?

specifically how to make this for loop take the cars in queue(or at the red light)and have them go

clc %This code made me lose alot of sleep
clear
n=4500;%this is just a number that always produces more then enough random numbers
x=zeros(n,1);%here i am initializing vectors
y=zeros(n,1);
z=zeros(n,1);
rlight=25;%optimum red light length
glight=60-rlight;
greencars= zeros(n,1);%greencars are cars that go through the light
inqueue=zeros(n,1);%inqueue are cars waiting for light to change
counter=zeros(121,1);%initializing a counter for the purpose of cycles
for time=1:7200
    if (mod(time,60)==0)
        counter=counter+1;
    end  
end
for i=1:n;
    if (i == 1)
        l=(.5+4.5*rand);
        x(i,1)=l;
        y(i,1)=mod(x(i),60);
    else
        l=(.5+4.5*rand);
        x(i,1)=x(i-1,1)+l;
        y(i,1)=mod(x(i),60); 
    end
    if y(i,1)<=35 
        greencars(i,1)=1
    else y(i,1)>35 
        inqueue(i,1)=1
    end 
    if x(i, 1) > 7200
     break; % break out of loop
    end
 queue=sum(inqueue);
 wait=inqueue;
 line=wait-1;
 sec_cross=3.2+line*1.4;
end

sum(y)
sum(greencars)
sum(inqueue)

[Azzi Abdelmalek]

It's not clear

Answer 1

[Walter Roberson]

There is no way to execute a command automatically as a result of changing a normal numeric variable -- not unless there is something that can be done with addlistener (and I would not expect there to be.)

If you need to execute a command automatically as a result of changing a variable by a certain value, you would probably need to define your own Object Oriented Programming (OOP) class.

It would probably be easier, though, to do all the changes to the variable by calling a function (that you would define) that would do all of the checking for sufficient changes and would call the routine when the conditions were right.

It would probably be better to reconsider how your code should operate.