FMINUNC cannot continue help?

Question

EB 2019-10-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487490-fminunc-cannot-continue-help

编辑： EB 2019-10-26

I am trying to learn how to use fminunc, but it gives the error "Failure in initial objective function evaluation. FMINUNC cannot continue."

Help please?

Note: Updated

        for i = 1:modes
            
                params.x0 = [y0 dy0];
                params.xp = xspan;
                
                fobj = @(beta)myobj(beta, params);
                    
                for j = 1:1000   % begin convergence loop for beta
            
                    beta = fminunc(fobj, beta0);    % run optimization
            
                end % end convergence loop
            
            end
            %%
            function [err, T, Y] = myobj(beta)
            
                x0 = params.x0;
                xspan = params.xp;
                
                [T,Y] = ode45('ffunc', xspan, x0);
                err = abs(Y(end,2) + sqrt(K*L.^2 - beta)*Y(end,1));  % error
            end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2019-10-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487490-fminunc-cannot-continue-help#answer_398267

编辑：Matt J 2019-10-25

在 MATLAB Online 中打开

You forgot to pass your params,

 fobj = @(beta)myobj(beta,params);
 
             function [err, T, Y] = myobj(beta,params)
            
                x0 = params.x0;
                xspan = params.xp;
                
                [T,Y] = ode('ffunc', xspan, x0);
                err = abs(Y(end,2) + sqrt(K*L.^2 - beta)*Y(end,1));  % error
            end