Error using barrier Objective function is undefined at initial point. Fmincon cannot continue. Error fmincon (line 848)

I run my main program Train_PF.m. In my main program Train_PF.m , I have declared the initial point u0 as initial point. But there is error said undefined at initial point.

 Steps i= 2
Elapsed time is 1.780754 seconds.
Elapsed time is 0.037505 seconds.
Elapsed time is 0.025071 seconds.
Elapsed time is 0.024210 seconds.
Elapsed time is 0.028659 seconds.
Elapsed time is 0.028935 seconds.
Elapsed time is 0.028281 seconds.

 Steps i= 3
Error using barrier
Objective function is undefined at initial point. Fmincon cannot continue.

Error in fmincon (line 848)
    [X,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = barrier(funfcn,X,A,B,Aeq,Beq,l,u,confcn,options.HessFcn, ...

Error in Train_PF (line 115)
    [u, Cost(i,1), Exitflg(i,1), output] = fmincon(@(u) Fungsicos( Np, Tim_step, X0 ,u,
    Vehicle_Type,Q1,Xdes,R1,F1,Xa,G1,Xnba), ...

[Mario Malic]

This is too much for anyone here to take a look at. Try debugging , stop it before it enters i = 3 and look what happens step by step, maybe you made a mistake at indexing somewhere.

[Matt J]

But there is error said undefined at initial point.

Do you have some reason to dispute what the error message is telling you? Have you tested the objective function at the initial point u0?

[Ivan Dwi Putra]

I have declared the initial point u0

In the main program Train_PF

line 55
ua = zeros(Np,Num_veh);       % Assumed Braking or Tracking Torque input of each vehicle;

line 62
% Initialzie the assumed state for the first computation: constant speed
for i = 1:Num_veh
    ua(:,i) = Torque(1,i);
    Pa(1,i) = Postion(1,i);                % The first point should be interpreted as k = 0 (current state)
    Va(1,i) = Velocity(1,i);
    Ta(1,i) = Torque(1,i);
    for j = 1:Np
        [Pa(j+1,i),Va(j+1,i),Ta(j+1,i)] = traindiscretemodel(ua(j,i),Tim_step,Pa(j,i),Va(j,i),Ta(j,i),Mass(i),Ca_0(i),Ca_1(i),Ca_2(i),Tao(i),R(i),Eta);
    end    
end


line 105
u0 = ua(:,1); 

and in workspace there is u0

this is the contents of u0

-12932.1345678792

30596.4676587217

30596.5703111409

30596.5703117487

30596.5703119381

30596.5703120182

30596.5703120480

30596.5703120420

30596.5703119954

30596.5703118750

30596.5703115299

30596.5703087468

-4477.98446486301

-30596.5703109786

-30596.5703120141

-30596.5703122289

-30596.5703123201

-30596.5703123697

-30596.5703124006

NaN

[Matt J]

That's not what I asked, though. I asked if you have tested if the objective function gives a reasonable output when input u0

[Ivan Dwi Putra]

I;m sorry, I dont quite understand How I tested it?

[Bruno Luong]

Have you noticed you have NaN in u0 (last element)?

[Mario Malic]

Actually, his objective function works with this NaN.

He has 7 fmincons that run fine for the first step which is i = 2, in the second step i = 3, this happens.

[Ivan Dwi Putra]

ok thank you everyone, i will try first to understand the error especially NaN u0

[Ivan Dwi Putra]

How i change NaN in the workspace? I'm trying to find the meaning error but still confuse. Can anyone help me?