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r=M2(2,1)/M2(1,1);
    Fi=atan2(imag(r2),real(r2));%ÓëyÖáµÄ¼Ð½Ç£¬¶ø²»ÊÇÓëxÖáµÄ¼Ð½Ç£¬ËùÒÔrealÓëimagµ÷»»ÁËÒ»ÏÂ
    Fi1=0-Fi/pi;    %³õʼÏàλ¼õÈ¥×îºóµÄÏàλ£»
    A(1,i)=Fi1;
    i=i+1;
  if (i>121)
      break;
  end
x=0:1/60:2;
plot(x,A)
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A(A<0)=A(A<0)+pi*2;
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