GEtting err0r

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Getting error In Code

Unable to perform assignment because dot indexing is not supported for variables of this type.

x=optimvar('x',3,'LowerBound',[0, 0, -inf],'UpperBound',[inf, inf, inf]);
Obj=(x(1)-(2 *x(2))+3*x(3));
A =x(1)+x(2)+x(3)<=7;
B =-x(1)+x(2)-x(3)<=2;
C =3*x(1)-x(2)-2*x(3)==-5;
Problem=optimproblem('Objective',Obj,'ObjectiveSense','maximize');
Problem.Constraints.con_1 = A;
Problem.Constraints.con_2 = B;
Problem.Constraints.con_3 = C;
x0.x=[0 0 0]; 
[sol,xfval,exitflag,output] = solve(Problem,x0)

Unable to perform assignment because dot indexing is not supported for variables of this type.

pls Guide me

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Walter Roberson 2022-9-15

编辑：Walter Roberson 2022-9-15

在 MATLAB Online 中打开

Code works for me here.

x=optimvar('x',3,'LowerBound',[0, 0, -inf],'UpperBound',[inf, inf, inf]);
Obj=(x(1)-(2 *x(2))+3*x(3));
A =x(1)+x(2)+x(3)<=7;
B =-x(1)+x(2)-x(3)<=2;
C =3*x(1)-x(2)-2*x(3)==-5;
Problem=optimproblem('Objective',Obj,'ObjectiveSense','maximize');
Problem.Constraints.con_1 = A;
Problem.Constraints.con_2 = B;
Problem.Constraints.con_3 = C;
x0.x=[0 0 0]; 
[sol,xfval,exitflag,output] = solve(Problem,x0)
Solving problem using linprog.
The dual-simplex algorithm uses a built-in starting point;
ignoring supplied X0.

Optimal solution found.
sol = struct with fields:
    x: [3×1 double]
xfval = 17.4000
exitflag = 
    OptimalSolution
output = struct with fields:
         iterations: 1
    constrviolation: 0
            message: 'Optimal solution found.'
          algorithm: 'dual-simplex'
      firstorderopt: 8.8818e-16
             solver: 'linprog'
sol.x
ans = 3×1
    1.8000
         0
    5.2000