Why my Nonlinear function cannot be solved??

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...!

Answer 1

[Matt J]

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

[연승 김]

Wow. you're genius!!!!!! Wow.. amazing...

I have to study hard!!