这句MATLAB是什么意思

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for i=1:n
7 L) w. ?, E5 H/ L# ]4 X8 O    cta(i)=angle(B2(i,3));
    U(i)=abs(B2(i,3));
- h+ m; S  q/ }; U; \    %V(i)=B2(i,4);
end
for i=1:n
+ ^+ v& r* s' O) s, ^$ ?# q8 |    S(i)=B2(i,1)-B2(i,2);
    B(i,i)=B(i,i)+B2(i,5);
( t  Y. a$ ~8 Gend
8 e6 e; P8 a  ~8 m" f# W' TP=real(S);Q=imag(S);
" v9 ~. `2 }5 t: |  R+ ?2 g; F0 BB2怎么给值