MATLAB 复数拟合

function complexfittness
 A=[5.16957        1.854        4.5139
 4.96279        1.9351        4.5777
 4.77192        2.0221        4.4781
 4.59518        2.2499        4.4845
 4.43106        2.4131        4.4123
 4.27827        2.4371        4.2267
 4.13566        2.5316        4.2037
 4.00225        2.4857        4.0696
 3.87718        2.423        4.0088
 3.75969        2.3258        3.9657
 3.64911        2.2346        3.9744
 3.54485        2.1211        4.0029
 3.44638        2.0217        3.9768
 3.35324        1.9259        4.0347
 3.26499        1.7979        4.0694
 3.18128        1.6816        4.1519
 3.10174        1.5758        4.2297
 3.02609        1.4618        4.3118
 2.95404        1.349        4.4147
 2.88534        1.2358        4.5199
 2.81977        1.1288        4.6318
 2.75711        1.0211        4.7553
 2.69717        0.91735        4.8912
 2.63978        0.82449        5.0257
 2.58479        0.72731        5.1696
 2.53204        0.63739        5.3123
 2.4814        0.55013        5.4608
 2.43274        0.46586        5.6101
 2.38596        0.3817        5.7683
 2.34094        0.29769        5.9288
 2.29759        0.21975        6.0866
 2.25581        0.13974        6.2456
 2.21553        0.05831        6.4087
 2.17666        -0.01903        6.5741
 2.13913        -0.09677        6.741
 2.10288        -0.17371        6.9131
 2.06783        -0.25195        7.0895
 2.03393        -0.32701        7.2693
 2.00113        -0.40537        7.4545
 1.96936        -0.47767        7.6404
 1.93859        -0.55092        7.8317
 1.90877        -0.61842        8.0211
 1.87985        -0.681        8.2169
 1.85179        -0.75217        8.4168
 1.82456        -0.81475        8.62
 1.79811        -0.87674        8.8299
 1.77243        -0.93379        9.0445
 1.74746        -0.98867        9.2611
 1.72319        -1.0438        9.4708
 1.69959        -1.087        9.6975
 1.67662        -1.1357        9.9155
 1.65426        -1.177        10.136
 1.6325        -1.2