doing some orders in specific time in a loop

Hi

I'm using this code to do some orders in a for loop, I want to measure the time in the loop and if the passed time equals to a specific value do another order else wait until that specific time but the code do the for loop as soon as posible and never checked that time.could you help me please,

this is the code:

clear,clc
a = 5;
b = ones(2);
x = zeros(2);
t3 = zeros(1,5);
for i = 1:5
    tic

   c = a*b;
    k = x-2*c;
    x = k;


  while toc == 0.5
       k = k*3;
   
   end
end

Answer 1

[john white]

hi every one I found the answer and I write that here maybe it be useful for others

clear,clc
a = 5;
b = ones(2);
x = zeros(2);
t3 = zeros(1,5);
for i = 1:5
    tic
   c = a*b;
    k = x-2*c;
    x = k;
  s = 0.5-toc;
  if sign(s)==1
      pause(s)
  else
      pause(0)
  end
       k = k*3;
   
   end