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Error in fmincon: undefined getIpOptions

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Good evening,
I am trying to use fmincon to fit a multinomial tree model to behavioural data. I'm aware that other questions have been asked about the same error, but those questions haven't been resolved (see for example and wouldn't apply in my case anyway. Five parameters, each with the lower bound [0] and the upper bound [1], are to be estimated to minimize a G-squared estimate of goodness of fit (expressed in a customized function "Goodness_of_Fit_1", which itself works fine). No other constraints apply here, resulting in the following syntax:
fmincon(@Goodness_of_Fit_1, [0,0,0,0,0], [],[],[],[],[0,0,0,0,0],[1,1,1,1,1])
However, this returns the following error:
Undefined function or variable 'getIpOptions'.
Error in fmincon (line 811)
options = getIpOptions(options,sizes.nVar,mEq,flags.constr,defaultopt,10,0.01);
I am using Matlab R2018b and the path to fmincon is correct (uses the same version).
Thank you very much for your help!

Answers (2)

Jim Hokanson
Jim Hokanson on 26 Nov 2019
I had this problem and just reinstalled the optimizaton toolbox ...
alok kumar
alok kumar on 25 Jan 2022
There is a add-on option at top right side. you can search for optimization toolbox there.

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Matt J
Matt J on 25 Jul 2019
Well, it should be there. On my machine,
>> which -all getIpOptions
F:\Program Files\MATLAB\R2018b\toolbox\optim\optim\getIpOptions.m
I suggest you check your anti-virus software to see if it may have quarantined it. Then, I would do a complete clean re-install. By clean reinstall, I mean you first delete any existing R2018b folders.
Marcelo Fernandes
Marcelo Fernandes on 25 Nov 2019
For anyone having this problem, it appears to happen when you install a new version of MATLAB and uninstall the older versions from the computer - in this order. It could be that those files (such as getIpOptions.m) have not been installed because of previous files on the computer.
I followed Matt J's suggestion and it's fixed.
Thank you, Matt!

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