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<P>在matlab6.5中,用FFT运算得到的数组中,怎样分析谐波数据?例如,x=[-3328 -2623 -2550 -2712 -2970 -3327 -3736 -4239 -4647 -4991 -5137 -5165 -4982 -4569 -3909 -3105 -2058 -1028 199 1353 2390 3481 4347 4647 5126 5381 5383 5279 4803 4305 3656 3023 2742 2619 2644 2869 3160 3590 3995 4491 4838 5145 5288 5164 4877 4347 3618 2726 1688 499 -684 -1798 -2872 -3775 -4525 -4971 -5281 -5220 -5177 -4994 -4585 -4093 -3379 -2790 ];<br>y=fft(x);---三次谐波应该是哪个数?是(4294.2 - 1809.7i)还是66506 - 36275i)?还是另外哪个?望指教!</P>
<P>y=<br>-1547 -1.5905e+005 + 24278i 4294.2 - 1809.7i 66506 - 36275i -2650.8 + 1710.8i 1560 - 761.25i -1342.6 + 539.04i 1175.4 - 71.262i -1017.5 + 74.837i 823.72 + 1039.6i -639.16 + 26.039i -317.18 + 1201.8i -239.69 + 544.89i -932.68 + 459.01i -985.02 + 421.11i -586.23 + 228.72i -1132 + 37i -803.97 + 663.92i -535.78 - 50.187i -1010.6 + 162.23i -552.13 + 431.41i -530.6 + 288.52i -1168.8 - 47.567i -808.04 + 625.64i -464.52 - 127.16i -1240.8 - 110.2i -527.75 + 68.557i -855.11 - 189.58i -525.42 - 22.683i -453.41 + 97.198i -823.1 + 90.154i -594.89 + 336.16i -585 -594.89 - 336.16i -823.1 - 90.154i -453.41 - 97.198i -525.42 + 22.683i -855.11 + 189.58i -527.75 - 68.557i -1240.8 + 110.2i -464.52 + 127.16i -808.04 - 625.64i -1168.8 + 47.567i -530.6 - 288.52i -552.13 - 431.41i -1010.6 - 162.23i -535.78 + 50.187i -803.97 - 663.92i -1132 - 37i -586.23 - 228.72i -985.02 - 421.11i -932.68 - 459.01i -239.69 - 544.89i -317.18 - 1201.8i -639.16 - 26.039i 823.72 - 1039.6i -1017.5 - 74.837i 1175.4 + 71.262i -1342.6 - 539.04i 1560 + 761.25i -2650.8 - 1710.8i 66506 + 36275i 4294.2 + 1809.7i -1.5905e+005 - 24278i<br></P>
[此贴子已经被作者于2006-4-4 15:14:31编辑过]
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