这句MATLAB是什么意思

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for i=1:n
  g4 R! ]0 q) h/ m0 `  p: g! L    cta(i)=angle(B2(i,3));
    U(i)=abs(B2(i,3));
    %V(i)=B2(i,4);
' {& J4 F0 Y: m3 dend
1 p" R+ M  G& x. L* gfor i=1:n
5 g/ V; N. ]7 e" \    S(i)=B2(i,1)-B2(i,2);
    B(i,i)=B(i,i)+B2(i,5);
end
) T3 H7 r$ g/ o  K( NP=real(S);Q=imag(S);
2 J5 K' D1 H* O) s4 |! H0 _B2怎么给值