这句MATLAB是什么意思

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for i=1:n
$ v5 R  y+ @# C8 W! C    cta(i)=angle(B2(i,3));
    U(i)=abs(B2(i,3));
    %V(i)=B2(i,4);
end
for i=1:n
    S(i)=B2(i,1)-B2(i,2);
' D" |1 L4 I3 k9 L    B(i,i)=B(i,i)+B2(i,5);
  J" d  |% R0 D+ @9 M9 nend
. z) j' s6 u2 m, V7 e9 |P=real(S);Q=imag(S);
B2怎么给值