Failure in initial objective function evaluation. FMINUNC cannot continue.

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I tried to evaluate this function but I am getting this error Failure in initial objective function evaluation.
FMINUNC cannot continue.
Please what is the best way to evaluate this function
f = x(2)^2*x(9)^2 + x(2)^2*x(9) + x(2)^3*x(9) - x(3)*x(5)*x(9)^2 + x(6)*x(8)*x(9)^2 + x(6)*x(8)*x(9)^3 + x(2)*x(6)*x(8)*x(9)^2;

Accepted Answer

Star Strider
Star Strider on 19 Nov 2019
Unless it is already in a function file, it needs to be an anonymous function:
f = @(x) x(2)^2*x(9)^2 + x(2)^2*x(9) + x(2)^3*x(9) - x(3)*x(5)*x(9)^2 + x(6)*x(8)*x(9)^2 + x(6)*x(8)*x(9)^3 + x(2)*x(6)*x(8)*x(9)^2;
If it is in a function file (and you have passed the function handle to fminunc correctly), the initial parameter estimates could be the problem. Please post those.
  9 Comments
Mohammed Ouallal
Mohammed Ouallal on 15 Aug 2020
Edited: Bruno Luong on 15 Aug 2020
It seems that you resolve the problem but did not show how! please be kind and share the complete solution.
Thank you for the understanding!
Star Strider
Star Strider on 15 Aug 2020
Yes, I did!
Unless it is already in a function file, it needs to be an anonymous function

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