Error in fmincon: undefined getIpOptions
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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 https://de.mathworks.com/matlabcentral/answers/447671-error-in-fmincon-getipoptions-not-found) and wouldn't apply in my case anyway. Five parameters, each with the lower bound  and the upper bound , 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!
Matt J on 25 Jul 2019
Well, it should be there. On my machine,
>> which -all getIpOptions
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.