Hi @vinusan
I'm unfamiliar with your Simulink model as well as the cost function that is related to Rise Time and Fall Time. However, you can basically call the ga() function using the script below to return the vector k that consists the local optimum resistance R and capacitance C values.
You are advised to study some examples here:
fun = @costfun;
⋮
[k, fval, exitflag, output] = ga(fun, nvars, A, b, Aeq, beq, lb, ub, nonlcon, options)
function J = costfun(k)
t0 = 0; % start time
tf = 20; % final time
h = 1e-2; % time step size
opts = simset('SrcWorkspace', 'current', 'DstWorkspace', 'current');
simOut = sim('MySimulinkModel', [t0:h:tf], opts); % Simulink file
cumJ = simOut.logsout.get(1).Values.Data; % cumulative_J
J = cumJ(end);
end
