Failure in initial objective function evaluation when I'm solving a linear programming.

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I'm solving this question above and my code is below:
This is my coding in first file
function z= myobj01(x)
x= -3*x(1)-4*x(2);
And this is my coding in second file
fun= @myobj01;
A=[1 1; 1 2; 0 1];
Aeq=[]; beq=[];
lb=[0,0]; ub=[];
The problem is occuring in my second coding
It shows
Output argument "z" (and maybe others) not assigned during call to "myobj01".
Error in fmincon (line 535)
initVals.f = feval(funfcn{3},X,varargin{:});
Error in myobj02 (line 8)
Caused by:
Failure in initial objective function evaluation. FMINCON cannot continue.
When I run the second coding.
May I ask, where's the problem?

Accepted Answer

Stephan on 25 Jun 2021
function z= myobj01(x)
z= -3*x(1)-4*x(2);

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