Error using sqpLineSearch (line 22) Objective function is undefined at initial point. Fmincon cannot continue.
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Hi,
I am trying to fit a new model in my data using fmincon:
[x,fval]=fmincon(@residualF,[0.01 0.01 0.01],[],[],[],[],[0 0 0],[10 10 10],[],options,Final_T(1:25),Int_A(1:25),5,Int_G(1,1:25))
Unfortunately Matlab gives the following error:
Error using sqpLineSearch (line 22)
Objective function is undefined at initial point. Fmincon cannot continue.
I used the same parameters before for other models. This new model is in frequency domain though so I use 'ifft' before I perform the optimization. I also checked that for my previous models in the frequency domain and it's working. Anyone would have any ideas why I have this error in my new model?
Thanks in advance!
G
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Accepted Answer
Matt J
on 17 Jun 2013
Edited: Matt J
on 17 Jun 2013
If you execute
residualF([0.01 0.01 0.01])
you will see that it does not return a finite real value. Possibly, you haven't called ifft with the 'symmetric' option and it is returning a complex-valued result.
2 Comments
Matt J
on 18 Jun 2013
No, I'm not sure where ifftshift would be relevant here. I was talking about the 'symmetric' option of ifft()
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