Error in fmincon: undefined getIpOptions

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Lukas Meyerolbersleben
评论： alok kumar 2022-1-25
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 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 [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!

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回答（2 个）

Jim Hokanson
Jim Hokanson 2019-11-26
I had this problem and just reinstalled the optimizaton toolbox ...
Matt J
Matt J 2019-7-25
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.
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Marcelo Fernandes
Marcelo Fernandes 2019-11-25
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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