Why do I get an error when I try to use optimization functions from base MATLAB 7.14 (R2012a)?

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When I try to use any of the optimization functions from base MATLAB 7.14 (R2012a) I get either of the following errors depending on the function used:
Undefined function 'optimset' for input arguments of type 'char'.
Undefined function 'optimset' for input arguments of type 'struct'.
Undefined function 'fzero' for input arguments of type 'function_handle'.
Undefined function 'fminbnd' for input arguments of type 'function_handle'.
Undefined function 'fminsearch' for input arguments of type 'function_handle'.
Undefined function 'lsqnonneg' for input arguments of type 'function_handle'.
These error messages are seen primarily just after migration from a previous version of MATLAB due to a path issue.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 26 Jul 2012
In MATLAB 7.14 (R2012a) the base MATLAB optimization related functions were moved from the following location
>> [matlabroot '\toolbox\matlab\funfun\']
to
>> [matlabroot '\toolbox\matlab\optimfun\']
Since MATLAB copies all the preferences from the previous release to the new preference directory the issue is caused because MATLAB is unable to find these function.
The fix for this issue is to execute the following commands so that the path is restored to default and the toolbox cache is updated:
>> restoredefaultpath
>> rehash toolboxcache
Since restoring the default path will remove any personal path changes, you can manually fix this by navigating to:
cd(matlabroot);
cd toolbox;
cd matlab;
addpath(genpath('optimfun'));
savepath;
rehash;

More Answers (3)

Chandrasekar Mallapu
Chandrasekar Mallapu on 25 Jan 2018
Reactor Modeling using Matlab.
When i try to use the options function using MATLAB R2011b I get the following errors.
'Undefined function 'optimoptions' for input arguments of type 'char'
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Tech Support
Tech Support on 13 Apr 2018
Edited: MathWorks Support Team on 19 Jan 2021
Hi Tanmoy,
If you are still experiencing this issue, please contact MathWorks support:
-Justin
MathWorks Installation & Licensing Support

65465 6465
65465 6465 on 30 Jan 2019
In matlab 2013a I get a similar error:
Undefined function 'fminunc' for input arguments of type 'function_handle'.
I have Optimization Toolbox, how can I solve it?
Code is below,it's from Andrew Ng Maching Leraing exc_2.
% Set options for fminunc
options = optimset('GradObj', 'on', 'MaxIter', 400);
% Run fminunc to obtain the optimal theta
% This function will return theta and the cost
[theta, cost] = ...
fminunc(@(t)(costFunction(t, X, y)), initial theta, options);

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