<< Graphics`Graphics`

ex. 5.17   Input data   p.89

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          0.0011475`}, {6.890625`, -0.001059`}, {6.898438`, -0.0029449`}, {6.90625`, -0.000647`}, {6.914062`, 
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          0.0016541`}, {6.984375`, -0.0006836`}, {6.992188`, 
          0.0004181`}, {7.`, 0.0029266`}, {7.007812`, 
          0.0008026`}, {7.015625`, -0.0015747`}, {7.023438`, 
          0.0011017`}, {7.03125`, 
          0.0017059`}, {7.039062`, -0.0015564`}, {7.046875`, -0.002124`}, {7.054688`, 0.0004486`}, {7.0625`, 
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          3.1`*^-6}, {7.132812`, -0.0014069`}, {7.140625`, 
          0.0012848`}, {7.148438`, 
          0.0020203`}, {7.15625`, -0.0005585`}, {7.164062`, -0.0001404`}, {7.171875`, 0.0020782`}, {7.179688`, 
          0.0013916`}, {7.1875`, -0.0008148`}, {7.195312`, 
          0.0003693`}, {7.203125`, 0.0025879`}, {7.210938`, 
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          0.000943`}, {7.234375`, 
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          0.0017029`}, {7.328125`, -0.0007965`}, {7.335938`, -0.0012634`}, {7.34375`, 0.0015656`}, {7.351562`, 
          0.0020264`}, {7.359375`, -0.0002838`}, {7.367188`, 
          0.0001343`}, {7.375`, 0.0026764`}, {7.382812`, 
          0.0016693`}, {7.390625`, -0.001178`}, {7.398438`, -0.0001282`}, {7.40625`, 
          0.0019623`}, {7.414062`, -0.0001678`}, {7.421875`, -0.0019348`}, {7.429688`, 0.0000275`}, {7.4375`, 
          0.0007294`}, {7.445312`, -0.0013794`}, {7.453125`, -0.0018921`}, {7.460938`, 0.0004181`}, {7.46875`, 
          0.0000305`}, {7.476562`, -0.002356`}, {7.484375`, -0.0011719`}, {7.492188`, 0.0012054`}, {7.5`, 
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          0.0001617`}, {7.523438`, 0.0020355`}, {7.53125`, 
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          0.0015106`}, {7.554688`, 
          0.0024323`}, {7.5625`, -0.0007172`}, {7.570312`, -0.0006958`}, {7.578125`, 0.0024445`}, {7.585938`, 
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          0.0000336`}, {7.609375`, 
          0.0016479`}, {7.617188`, -0.0002014`}, {7.625`, -0.0021362`}, {7.632812`, 0.0000122`}, {7.640625`, 
          0.0008057`}, {7.648438`, -0.0017761`}, {7.65625`, -0.0017578`}, {7.664062`, 
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          0.0018158`}, {7.734375`, -0.0002258`}, {7.742188`, -0.001001`}, {7.75`, 0.0013123`}, {7.757812`, 
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          0.0005951`}, {7.851562`, -0.0011475`}, {7.859375`, -0.0017639`}, {7.867188`, 0.0005157`}, {7.875`, 
          0.000119`}, {7.882812`, -0.0017731`}, {7.890625`, -0.0007446`}, {7.898438`, 0.0013855`}, {7.90625`, 
          0.0007996`}, {7.914062`, -0.0011841`}, {7.921875`, 
          0.0001343`}, {7.929688`, 0.0017426`}, {7.9375`, 
          0.0000793`}, {7.945312`, -0.0005646`}, {7.953125`, 
          0.0013672`}, {7.960938`, 
          0.0014679`}, {7.96875`, -0.0005981`}, {7.976562`, -0.0002136`}, {7.984375`, 0.0015076`}, {7.992188`, 0.0004425`}, {8.00000, 
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Plot Data

{data[[1]], data[[1024]], data[[1025]]}

zu1 = ListPlot[data, PlotJoined ->  True]

ft = Interpolation[data]
Plot[ft[t], {t, 0, 8}, PlotRange -> {-0.03, 0.03}]

fft[data_, tt_, ns_, line_, 
        max_] := {dat = 
          Table[data[[i, 2]], {i, ns}]; 
dft = 
          2  Fourier[dat]/Sqrt[ns]; 
        dft[[1]] = dft[[1]]/2; 
dft2 = 
          Table[{(n - 1)/tt, Abs[dft[[n]]]}, {n, 
              line + 1}]; 
zu2 = 
          ListPlot[dft2, PlotRange ->  {{0, line/tt}, {0, max}}, 
            PlotStyle ->  {Hue[0.9], PointSize[0.03]}, 
            GridLines ->  Automatic, 
            PlotJoined ->  True]}

fft[data, 8, 1024, 400, 0.01]

dft2dB = 
        Table[{(n - 1)/8, 20 Log[10, Abs[dft[[n]]]]}, {n, 
            1024}];
zu3 = 
      ListPlot[dft2dB, PlotRange ->  {{0, 50}, {-100, -20}}, 
        PlotStyle ->  {Hue[0.9], PointSize[0.03]}, 
        GridLines ->  Automatic, PlotJoined ->  True]

zu4 = 
      LogLinearListPlot[dft2dB, 
        PlotRange ->  {{1, 50}, {-100, -20}}, 
        PlotStyle ->  {Hue[0.9], PointSize[0.03]}, 
        GridLines ->  Automatic, PlotJoined ->  True]

Show[GraphicsArray[{{zu1, zu2}, {zu3, zu4}}]]