Why my Nonlinear function cannot be solved??

Question

연승 김 2021-9-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1462939-why-my-nonlinear-function-cannot-be-solved

评论： 연승 김 2021-9-29

I'm MATLAB beginner. so please help me~^^*

fun_y =
  function_handle with value:
    @(y1,y2)y1.*8.0e+1+y2.*7.0e+1-log(y1)-log(y2)
    
y1 = optimvar('y1');
y2 = optimvar('y2');    
prob.Objective = fcn2optimexpr(fun_y, y1, y2);
y0.y1 = 1;
y0.y2 = 1;
[sol,fval] = solve(prob,y0);

However, the error masssage is "Check for missing argument or incorrect argument data type in call to function 'solve'.".

I don't know how to correct... UU

Help me please...!

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Answer 1

Matt J 2021-9-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1462939-why-my-nonlinear-function-cannot-be-solved#answer_797494

编辑：Matt J 2021-9-29

在 MATLAB Online 中打开

fun_y=@(y1,y2)y1.*8.0e+1+y2.*7.0e+1-log(y1)-log(y2);
    
y1 = optimvar('y1');
y2 = optimvar('y2');    
prob = optimproblem('Objective',fcn2optimexpr(fun_y, y1, y2));
y0.y1 = 1;
y0.y2 = 1;
[sol,fval] = solve(prob,y0)
Solving problem using fminunc.

Local minimum possible.

fminunc stopped because the size of the current step is less than
the value of the step size tolerance.
sol = struct with fields:
    y1: 0.0125
    y2: 0.0143
fval = 10.6305