Error using optimoptions (line 124)

I am getting the error message mentioned in the title while executing following line

opts = optimoptions('fmincon','Algorithm','interior-point');

I tried setting the default path through

restoredefaultpath
savepath
rehash toolboxcache

Still getting the same error. Can someone help?

Thanks

[Ameer Hamza]

Error is causes inside the exception handler. Can you post the complete error message? Also, run the following line in command window

dbstop if caught error

and run your code again. The code will automatically halt when the error occurs and open a file. Please tell name of that file.

[Vishakha Ranade]

C:\Program Files\MATLAB\R2020a\toolbox\shared\optimlib\+optim\+options\Fmincon.m

This is the file name where the code halts.

Also the complete error message is as follows-

Error using optimoptions (line 124)

Empty keys are not allowed in this container.

Error in Main (line 47)

opts = optimoptions('fmincon','Algorithm','interior-point');

[Mario Malic]

Do you have one set of options, and then you're calling another ones?

Is this the complete error message?

[Vishakha Ranade]

I have only one set of options. Infact since 'interior-point' is the default option for algorithm, I also tried the same command without any options as

opts = optimoptions('fmincon');

But still I get the same error.

[Mario Malic]

Try this example, if you can't open it, here's link

openExample('optim/NondefaultOptionsfminconExample')

Does it report error, if it does, then there might be something wrong with your MATLAB files.

[Vishakha Ranade]

When I tried this example, I got following error-

Error using exampleUtils.componentExamplesDir (line 13)

Invalid argument "optim".

Error in findExample (line 18)

componentExamplesDir = exampleUtils.componentExamplesDir(component);

Error in openExample (line 30)

metadata = findExample(exampleId);

Does that mean I need to install MATLAB again on my computer?

[Mario Malic]

Get the code from link and try it.

[Vishakha Ranade]

I tried following code as you suggested

options = optimoptions('fmincon','Display','iter','Algorithm','sqp');
fun = @(x)100*(x(2)-x(1)^2)^2 + (1-x(1))^2;
A = [];
b = [];
Aeq = [];
beq = [];
lb = [];
ub = [];
nonlcon = @unitdisk;
x0 = [0,0];
x = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,nonlcon,options)

with the unitdisk defined in other file with same name as

function [c,ceq] = unitdisk(x)
c = x(1)^2 + x(2)^2 - 1;
ceq = [];

Getting the following error

Error using optimoptions (line 124)

Empty keys are not allowed in this container.

Error in problem (line 1)

options = optimoptions('fmincon','Display','iter','Algorithm','sqp');

Can you figure out what must be going wrong?

Thanks for spending your time on my problem

Answer 1

[VBBV]

%if true
  % code
% end
opts = optimoptions(@fmincon,'Algorithm','interior-point');

Try function handle for passing solver name

[Vishakha Ranade]

Tried your suggestion, still getting the same error

Error using optimoptions (line 124)

Empty keys are not allowed in this container.

Error in Main (line 47)

opts = optimoptions(@fmincon,'Algorithm','interior-point');

Following are the two lines of code where I am trying to use this

opts = optimoptions(@fmincon,'Algorithm','interior-point');

[C, SSE] = fmincon(@subfile,[1, 1, 1, 1, 1],[],[],[],[],[0, 0, 0, 0, 0.8],[10 10 10 10 0.8],[],opts,x_b,x_m, NCLD_EXP); % for CLD2

Can you see any problem?

Thanks

[VBBV]

Many input arguments for fmincon

Specify lower and upper bound values, they cant be empty [] []

Use opts as last argument of fmincon function

What is NCLD_EXP ? Did you define the function @subfile before

[Vishakha Ranade]

1. I have defined function @subfile before
2. I tried putting opts at the end as last argument with no success
3. In my arguments the four [ ] are given in order to indicate that there is no linear or nonlinear constraints
4. the lower bounds are [0 0 0 0 0.8] and upper bounds are [10 10 10 10 0.8]
5. I tried executing the code by removing x_b,x_m, NCLD_EXP (which were the parameters in @subfile) as

[C, SSE] = fmincon(@subfile,[1, 1, 1, 1, 1],[],[],[],[],[0, 0, 0, 0, 0.8],[10 10 10 10 0.8],opts);

again without any success

Any suggestions? Thanks

[Mario Malic]

[C, SSE] = fmincon(@subfile,[1, 1, 1, 1, 1],[],[],[],[],[0, 0, 0, 0, 0.8],[10 10 10 10 0.8],[], opts);
%                                             You're missing one empty argument for nonlcon ^^

Please, it's best if you define these input arguments before this line of code, it will be much more readable.

[VBBV]

@Vishaka Can you show the error message?

[Vishakha Ranade]

sorry, thats right. I inserted the argument for 'nonlcon' as you have suggested. Still getting the same error!

Is this something related to 'Path'?

Thanks

[Vishakha Ranade]

This is the error message

Error using optimoptions (line 124)

Empty keys are not allowed in this container.

Error in Main (line 47)

opts = optimoptions(@fmincon,'Algorithm','interior-point');

[VBBV]

Which version of MATLAB are you using?

[VBBV]

https://www.mathworks.com/matlabcentral/answers/512878-optimoptions-error-empty-keys-are-not-allowed-in-this-container-no-number-given

Look at the solution in this link. It seems you don't have global optimization toolbox

[Vishakha Ranade]

MATLAB R2020a

[Vishakha Ranade]

I referred to the link you have sent.

Looks like my problem would be solved. Thanks a lot

Answer 2

[Bruno Luong]

Make sure you have optimization toolbox installed

>> ver
-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.9.0.1495850 (R2020b) Update 1
MATLAB License Number: xxxxxx
Operating System: Microsoft Windows 10 Home Version 10.0 (Build 19042)
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.9         (R2020b)
MATLAB Compiler                                       Version 8.1         (R2020b)
Optimization Toolbox                                  Version 9.0         (R2020b)
Signal Processing Toolbox                             Version 8.5         (R2020b)

[Mario Malic]

It's a good idea to remove your license number I believe.

[Ameer Hamza]

I edited away the License number.

[Bruno Luong]

thanks to both of you

[Vishakha Ranade]

Thanks, I am reinstalling with global optimization toolbox

[Bruno Luong]

you only need the optimization toolbox where FMINCON belongs, not the global optimization tollbox.

TMW makes this ridiculuous split. Well not totally ridiculuos since they can make more moneys with the cut.

[Vishakha Ranade]

Thanks a lot. My problem is solved by reinstalling global optimization toolbox. I had already installed the optimization toolbox previously.

Somehow global optimization solved the problem.

[Bruno Luong]

Odd I don't own global optimization toolbox and it works for me.