MATLAB: Values of NaN or Inf are included in the finite-difference derivatives at the initial point. I cannot continue to calculate with fmincon.

fminconOptimization Toolbox

Hello, I 'm working on the nonlinear programmming with constraints.
>> load('JIRIOT_is3.mat')
>> options = optimoptions(@fmincon, 'Display','iter','Algorithm','interior-point');
>> [x,fval,exitflag,output,lambda] = fmincon(@(x)mindistance_xo(x,x0),x0,A,b,Aeq,beq,lb,[],[],options)
But, matlab replied the error message as follows:
>>Value of NaN or Inf is included in the finite-difference derivatives at the initial point.
I enclosed the data file('JIRIOT_is3.mat') and objective function file(mindistance_xo.m).
Could you please give some advices to me how to solve the above program?

Best Answer

Thank you for providing the error message:
 Value of NaN or Inf is included in the finite-difference derivatives at the initial point.
This tells you exactly why fmincon cannot continue. You have a few choices:
  1. Try different initial points, to attempt to find one where the estimated derivative at the initial point exists and is finite
  2. Examine your objective and nonlinear constraint functions carefully to see why they are returning NaN or Inf
Good luck,
Alan Weiss
MATLAB mathematical toolbox documentation
Related Question