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Error in fmincon - getIpOptions is coming as unrecognized function or variable

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Harshvardhan Tandon
Harshvardhan Tandon on 9 Jun 2020
This is the exact error below:
Unrecognized function or variable 'getIpOptions'.
Error in fmincon (line 832)
options = getIpOptions(options,sizes.nVar,mEq,flags.constr,defaultopt,10,0.01);
How do i solve this error and move forward ?


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Answers (1)

Chidvi Modala
Chidvi Modala on 12 Jun 2020
The file 'getIpOptions.m' should be stored in the directory identified below. You can run this line of code which should open the directory where this function is stored and look for that function (for Windows):
If the file exists, the path has somehow been removed. You may restart MATLAB and see if the problem goes away. If it doesn't go away, check your startup.m file (if that file exists) to determine if you're removing important paths. You could also try running
If the file does not exists, you can reinstall Optimization Toolbox to resolve the issue.


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Chidvi Modala
Chidvi Modala on 12 Jun 2020
You require the Optimization Toolbox. You can use the following command to view all the installed MATHWORKS products
It looks like you are licensed for 'Optimization Toolbox'. To install the toolbox you can refer to this.
If the toolbox has already been installed, try reinstalling it.
Walter Roberson
Walter Roberson on 12 Jun 2020
"interior-point" is the default option for most cases, but you can use optimset() to select a different one. If your choice is not compatible with your system of equations, it will tell you before doing much work.
getIPOptions() stands for "get Interior Point options", and is only used if Interior Point is the active algorithm. If getIPOptions is not available then choose a different Algorithm.
Harshvardhan Tandon
Harshvardhan Tandon on 16 Jun 2020
Thank you for your help Walter and Chidvi !
I have installed the 'Optimization Toolbox' and my problem has been solved.

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