How can I disable fminsearch function to print a warning message?

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Merse Gaspar 2023-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/2014576-how-can-i-disable-fminsearch-function-to-print-a-warning-message

评论： Steven Lord 2023-8-29

warning('off') is not workink. Why? I get the following message: Exiting: Maximum number of function evaluations has been exceeded - increase MaxFunEvals option. But I want to ignore, and desable printing it.

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Merse Gaspar 2023-8-29

As far as I know, this function does not use the standrad warning stuff. I has to do something with this:

MATLAB:optimfun:fminsearch:ExitingMaxFunctionEvals

But I don't know what is this, and how to disable it.

Steven Lord 2023-8-29

As far as I know, this function does not use the standrad warning stuff.

That is correct. This message is not a warning.

I has to do something with this:

MATLAB:optimfun:fminsearch:ExitingMaxFunctionEvals

But I don't know what is this, and how to disable it.

That allows MATLAB to retrieve localized text for certain languages and certain text in the MATLAB Desktop.

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Answer 1

Matt J 2023-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/2014576-how-can-i-disable-fminsearch-function-to-print-a-warning-message#answer_1296366

在 MATLAB Online 中打开

fminsearch(___, optimset('Display','off'))

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Answer 2

dpb 2023-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/2014576-how-can-i-disable-fminsearch-function-to-print-a-warning-message#answer_1296371

编辑：dpb 2023-8-29

在 MATLAB Online 中打开

options = optimset('MaxIter',20);

fun = @(x)100*(x(2) - x(1)^2)^2 + (1 - x(1))^2;

x0 = [-1.2,1];

x = fminsearch(fun,x0,options)

Exiting: Maximum number of iterations has been exceeded - increase MaxIter option. Current function value: 2.002182

x = 1×2

-0.3720 0.1037

lastwarn

ans = 0×0 empty char array

options = optimset('Display','final','MaxIter',20);

[x,~,~,s] = fminsearch(fun,x0,options);

Exiting: Maximum number of iterations has been exceeded - increase MaxIter option. Current function value: 2.002182

options = optimset('Display','none','MaxIter',20);

[x,~,e,s] = fminsearch(fun,x0,options);

warning('off') doesn't work because the message isn't a warning; it's a normal informative output message.

As the above shows, the only way to suppress it is to turn output off entirely and then retrieve the result from the output variable. The exit flag variable, e will be 0 if this is the cause or the message content itself is a member of the output struct, s