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我有一组坐标,用傅里叶级数拟合了该坐标组,生成了傅里叶函数,但是我不会对该傅里叶函数组,做FFT变换,有人会吗?帮个忙
fittedmodel1 =
General model Fourier8:
fittedmodel1(x) =
a0 + a1*cos(x*w) + b1*sin(x*w) +
a2*cos(2*x*w) + b2*sin(2*x*w) + a3*cos(3*x*w) + b3*sin(3*x*w) +
a4*cos(4*x*w) + b4*sin(4*x*w) + a5*cos(5*x*w) + b5*sin(5*x*w) +
a6*cos(6*x*w) + b6*sin(6*x*w) + a7*cos(7*x*w) + b7*sin(7*x*w) +
a8*cos(8*x*w) + b8*sin(8*x*w)
Coefficients (with 95% confidence bounds):
a0 = -54.08 (-55.13, -53.03)
a1 = 28.61 (26.98, 30.24)
b1 = -53.2 (-54.75, -51.66)
a2 = 3.899 (2.536, 5.263)
b2 = -6.457 (-7.881, -5.032)
a3 = 3.01 (1.655, 4.365)
b3 = -3.211 (-4.605, -1.817)
a4 = 2.153 (0.7878, 3.518)
b4 = -1.692 (-3.068, -0.3151)
a5 = 1.692 (0.3438, 3.041)
b5 = -1.316 (-2.706, 0.07436)
a6 = 1.304 (-0.06926, 2.677)
b6 = -0.9888 (-2.357, 0.3794)
a7 = 1.163 (-0.1824, 2.509)
b7 = -0.681 (-2.067, 0.7046)
a8 = 1.493 (0.172, 2.814)
b8 = -0.509 (-1.809, 0.7915)
w = 0.005195 (0.00515, 0.00524)
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