plot and surf 3D graph

dear all, i am a new learner of matlab and was given a assignment to solve a matlab programming question. some errors occur and i unable to plot 3D graph. the error shown is as follow:

??? Error using ==> plot
Data may not have more than 2 dimensions

Error in ==> aaa at 28
subplot(2,2,1), plot(sseff);

the work that I did is as follow:

for Kp = 1:1:3
    for tau = 1:1:3
       for theta = 1:1:3
            for lambda = 1:1:3

                %Tuning the controller
                 Kc(Kp, tau, theta, lambda) = (2*tau+theta)/2*Kp*(lambda+theta);
                 taui(tau, theta)= tau+theta/2;
                 taud(tau, theta)= tau*theta/(2*tau+theta);

                num = Kp;
                den = [tau 1];
                sp = 1;
                [numCL,denCL]=cloop(Kc(Kp, tau, theta, lambda)*num*theta,den, -1);
                t=0:0.01:5;
                y = step(numCL, denCL,t);
                sse = (sp - y);
                ssef =sum(sse'*sse);
                sseff(Kp, tau, theta, lambda) = ssef   
            end
       end
    end       
end
subplot(2,2,1), plot(sseff);
title('Plot of SSE with multiple values of Tau')
ylabel('Sum of Square Error')
xlabel('Tdelay')
grid;
subplot(2,2,2), surf(sseff')
title('Plot of Sum of Square Error')
ylabel('Tau')
xlabel('Tdelay')
zlabel('Sum of Square Error')
subplot(2,2,3),plot(Kc)
title('Plot of Gain Kc')
xlabel('Tdelay')
ylabel('Sum of Square Error')
grid;
subplot(2,2,4),surf(Kc')
title('Plot of Kc with multiple values of Tau')
ylabel('Tau')
xlabel('Tdelay')
zlabel('Sum of Square Error')

so can anyone help me to find out what are the errors and the correct answers? thank you. My email address: [e-mail]

Answer 1

[Fangjun Jiang]

The error message says it all. Data used in plot() may not have more than 2 dimensions. Your data sseff seems to have a dimension of 4.