How to replace my optimset with equivalent optimoptions ?

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farzad 2019-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/470075-how-to-replace-my-optimset-with-equivalent-optimoptions

编辑： Matt J 2019-7-4

Hi all

using Fsolve, I am getting into difficulties and want to use Jacobian and Hessian as well , but first I need to pass from optimset to optimoptions

currently my Options are :

options = optimset('Display','iter','MaxFunEvals',1e6,'MaxIter',1e6,'TolFun',1e-3,'DerivativeCheck','on','Diagnostics','on');

so first, I need to have the equivalent optimoptions and then include Jacobian and Hessian.

since for some of my input data no solution is found ( Func-Count = 1.5e+7 ) , I need to imrpove my solution

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Matt J 2019-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/470075-how-to-replace-my-optimset-with-equivalent-optimoptions#answer_381802

编辑：Matt J 2019-7-3

Why not just,

options = optimoptions(@fsolve, 'Display','iter','MaxFunEvals',1e6,'MaxIter',1e6,...
                       'TolFun',1e-3,'DerivativeCheck','on','Diagnostics','on');

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farzad 2019-7-3

Are you Sure diff is symbolic ?

and why can't I use symbolic ? shall you help me understand ?

Matt J 2019-7-3

编辑：Matt J 2019-7-4

Do you understand the difference between symbolic and numeric computation? In symbolic computation, you present the expression for a function, and the software tries to take its derivatives analytically, as you or I would in a calculus course. The result is an analytical expression for the derivative, not a number.

But fsolve is a numeric solver. It puts in numbers for x and expects your code to give back numbers for the resulting Jacobian(x). On top of that, it does this repeatedly with different x, in its search for a solution. For the sake of speed, therefore, you don't want your code redoing the calculus to get expressions for the Jacobian every time it is called.

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