MATLAB: Objective function is returning undefined values at initial point. FSOLVE cannot continue

simulink

I call "fsolve" function by using an interpreted MATLAB Function block in simulink.However, during simulation error occurs: "Objective function is returning undefined values at initial point. FSOLVE cannot continue". How can I solve the problem? Can anyone help me?

Best Answer

To investigate what the objective function is complaining about, evaluate the initial point yourself manually and inspect the result.

Related Solutions

MATLAB: Converged to an infeasible point.

The initial guess you have chosen

x0 = [1,1,1,1,1,1,1,1];

seems very arbitrary. You should devise an initial guess more likely to be close to expected solution values.

Also, your "nonlinear constraints" look very linear to me. Unless I'm mistaken, all the x(i) appear to be coefficients of sine and cosine terms. You should therefore use the Aeq,beq matrices, not the nonlcon input, to express them.

Finally, the abs(x(i)) expressions in your objective function are non-differentiable and will cause problems if any x(i) near zero are searched. Just impose lower bounds x(i)>=0.

MATLAB: Fmincon error message ‘Too many input arguments’

fmincon(@HourlyCost,x0,[],[],[],[],lb,[],[],options) says that HourlyCost is to be the objective function. Objective functions are always passed the current x value (the parameter whose value is to produce the minimum result). But your HourlyCost function is defined to take no arguments.

Your objective function is not required to use the parameter that is passed in, but it is required to accept a parameter.

function Cost_h=HourlyCost(X)

I have to ask, though, why you are asking to minimize something whose value is fixed? If your HourlyCost is always going to return the same result for all arguments then there isn't anything to minimize.

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Related Solutions

MATLAB: Converged to an infeasible point.

MATLAB: Fmincon error message ‘Too many input arguments’

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