How to solve Langrage Multiplier

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nazrin mokhtar 2020-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/520406-how-to-solve-langrage-multiplier

Why i cannot solve the langrange...it say empty double matrix...please someone help me

SF=[    0   -2/3    -1/3
        0   -1/3    -2/3
        0   1/3     -1/3    ];
A=[ 1   0
    0   1
    0   0   ];
B=[ 0
    0
    1   ];
PLmax=[ 30
        150
        150 ];
    Cost=[  10
            12
            11  ];
syms P1 P2 Pd
Pgen=[  P1
        P2];
    
f=10*P1+12*P2;  %obj func
Lmda=Pd-(P1+P2)==0;
Pi1=SF*(A*Pgen-B*Pd)<=PLmax;
Pi2=-SF*(A*Pgen-B*Pd)<=PLmax;
P1,P2>=0;
Pd==150;
Sol=solve ([f,Lmda,Pi1,-Pi2],[ P1 P2 Pd ])