trying to converge a variable/value used in a equation

i am fairly new to matlab and i have been trying to get a variable/value to converge but it looks like i am getting an infinite loop. can someone help me speed it up, tell me what is wrong or suggest a different approach. the following code is in a loop and thetadot is the value im trying to find at that point in time

   b = 10;
    torque_interation = zeros(1,(size(hx,2)-1));
    deltaKE = 100;
    thetadot(1,1) = RPS*2*pi();
    while abs(deltaKE) > 0.1
    q = thetadot(1,1);

    torque_interation(1,i) = (work_increment(1,i)*RPS)/q;
    % work in - work out = deltaKE
    deltaKE = work_increment(1,i) - torque_interation(1,i)*q;
    if deltaKE > 0 
        q = q + b;
    elseif deltaKE < 0 
        b = b/2;
        q = q - b;
    end

    end
    thetadot(1,i) = q;

[Oleg Komarov]

Post all the relevant details, for example what's RPS.

[shaun]

RPS = reverlations per second (500/60)

work_increment = work done by steam, it is different at every degree of rotation

hx is the distance piston has moved.

[shaun]

torque_interation (spelling error) is the torque at that point in time

Answer 1

[Andrew Newell]

If you combine these two lines

torque_interation(1,i) = (work_increment(1,i)*RPS)/q;
deltaKE = work_increment(1,i) - torque_interation(1,i)*q;

you get

deltaKE = work_increment(1,i)*(1-RPS);

so values of q and b don't have any effect.

[shaun]

thanks, missed that