MATLAB Coder Error - optimset Unrecognized parameter name: 'GradObj'

Question

Vadim Bertrand 2021-6-9

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https://ww2.mathworks.cn/matlabcentral/answers/852015-matlab-coder-error-optimset-unrecognized-parameter-name-gradobj

编辑： Steve Grikschat 2021-6-10

Hi,

I'm trying to generate C code of a function using MATLAB Coder but I am getting the following error when generating MEX:

Unrecognized parameter name: 'GradObj'

Full instruction is:

optionsNLP = optimset('GradObj', 'off', 'GradConstr', 'off', ...
        'DerivativeCheck', 'off', 'Display', 'iter', 'TolX', 1e-9, ...
        'TolFun', 1e-9, 'TolCon', 1e-9, 'MaxFunEval', 300, 'DiffMinChange', 1e-5);

It is working when I run the MATLAB script directly.

I am thinking that maybe it can not be generated because a Toolbox is required to use the GradObj parameter?

Does anyone knows a workaround if any?

Thanks.

Vadim

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Answer 1

Steve Grikschat 2021-6-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/852015-matlab-coder-error-optimset-unrecognized-parameter-name-gradobj#answer_721050

编辑：Steve Grikschat 2021-6-10

在 MATLAB Online 中打开

Hi Vadim,

For generating C code for fmincon (or lsqnonlin, etc.) via MATLAB Coder, we require that you use the optimoptions function to set options. See the requirements in this documentation page.

Also, an important note is that only the SQP algorithm of fmincon is supported for C code generation.

The equivalent code for your example is as follows

optionsNLP = optimoptions('fmincon','Algorithm','sqp','SpecifyObjectiveGradient', false, ...
   'CheckGradients', false, 'Display', 'iter', 'StepTolerance', 1e-9, 'FunctionTolerance', 1e-9, ...
         'ConstraintTolerance', 1e-9, 'MaxFunctionEvaluations', 300, 'DiffMinChange', 1e-5);