[Python] FFT, sort, subplot

[sort() 예제]

        priceDataDF = priceDataDF.sort_values(by=['stck_bsop_date'], ascending=True)
        priceDataList = priceDataDF.to_dict('records')
        closePriceList = priceDataDF['stck_clpr'].tolist()
        # closePriceList = priceDataDF['stck_clpr'].values # -> numpy 배열

[FFT 예제]

            targetList1 = closePriceList[startIndex:endIndex]
            targetFFT = np.fft.fft(targetList1)
            ampFFT = np.abs(targetFFT)
            phaseFFT = np.angle(targetFFT)

0	7.28500000e+03+0.00000000e+00j
1	2.04144113e+01-2.03971038e+01j
2	-3.76051178e+01-4.36506351e+01j
3	3.21923882e+01-2.67781746e+01j
4	2.05000000e+01-2.33826859e+01j
5	1.62825271e+01-3.64462629e+01j
6	-1.60000000e+01-1.70000000e+01j
7	-1.67991876e+01-1.05395803e+00j
8	2.50000000e+00+6.06217783e+00j
9	1.38076118e+01+1.12218254e+01j
10	3.86051178e+01-3.49364905e-01j
11	2.41022492e+01-5.78940863e+00j
12	7.00000000e+00+1.77635684e-15j
13	2.41022492e+01+5.78940863e+00j
14	3.86051178e+01+3.49364905e-01j
15	1.38076118e+01-1.12218254e+01j
16	2.50000000e+00-6.06217783e+00j
17	-1.67991876e+01+1.05395803e+00j
18	-1.60000000e+01+1.70000000e+01j
19	1.62825271e+01+3.64462629e+01j
20	2.05000000e+01+2.33826859e+01j
21	3.21923882e+01+2.67781746e+01j
22	-3.76051178e+01+4.36506351e+01j
23	2.04144113e+01+2.03971038e+01j

[subplot() 예제]

    def ShowGraphs(self, timeData, fftData, removeIndex0=False):
        plt.figure(figsize=(12, 6))

        plt.subplot(2,2,1)
        plt.plot(timeData)
        plt.title('Time Domain Data')

        if removeIndex0: fftData = fftData[1:]
        ampFFT = np.abs(fftData)
        phaseFFT = np.angle(fftData)

        plt.subplot(2,2,3)
        plt.plot(ampFFT)
        plt.title('Freq. Domain - Amp.')

        plt.subplot(2,2,4)
        plt.plot(phaseFFT)
        plt.title('Freq. Domain - Phase')

        plt.tight_layout()
        plt.show()