I have not studied the code thoroughly but it appears to me that you do not assign new values to any variables you used previously. Unless at least one input variable gets a new value, then when you iterate the results would have to come out exactly the same and you would iterate forever. Something needs to change inside the loop before you can hope to have your iteration terminate.
Your general code structure will look something like this:
Initialize your variables
while true %"true" is literal here, not an example variable name
Do some calculation
if your termination condition holds
break; %"break" is literal, a MATLAB command
end
%you only get here if you did not break out, so if the termination
%condition did not hold
end %of while loop. If the termination condition did not hold, loop back
