这句MATLAB是什么意思

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for i=1:n
7 {; e" R* ^. p' p. `7 ?5 u6 j$ p    cta(i)=angle(B2(i,3));
0 r+ O' S; }3 J2 a1 K, v    U(i)=abs(B2(i,3));
* z& X1 @1 m' O# J    %V(i)=B2(i,4);
end
for i=1:n
0 q( ^7 U4 @8 k0 }  g4 @6 I! W    S(i)=B2(i,1)-B2(i,2);
9 Q& B& g3 l' p    B(i,i)=B(i,i)+B2(i,5);
$ g$ A2 y# ~4 A# uend
P=real(S);Q=imag(S);
B2怎么给值