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Important steps to make download process of chimpak hindi a simple process. Chennai, downloaded. .Q: I can't figure out what's wrong with my sine-wave spectrum plot in python I'm trying to find the frequency components of a signal as part of an assignment that I'm working on. I'm using the scipy.signal package. As I understand it, I should be able to do something like this: import numpy as np import matplotlib.pyplot as plt import scipy.signal as signal import matplotlib.cm as cm import scipy.io as spio import re file1 = spio.loadmat('spectrum-07-20150727-0940.mat') file1_x = file1['x'] f = np.linspace(1,10,num=101) y = signal.lfilter([1, -f], [1, f], file1_x) cbar = signal.cm.get_cmap('jet') plt.clf() plt.plot(f, y, lw=1) plt.plot(f, y, 'b-', lw=2, c='red') plt.grid() plt.axis([0, 100, -5, 30]) plt.xlabel('Frequency [Hz]') plt.ylabel('Amplitude [dB]') plt.show() The plot I get is this: Am I doing something wrong? Shouldn't it plot out the corresponding spectra as vertical bars and then a sinusoid from 1Hz to 10Hz, as above? A: You want to plot the modulus of your signal, and not the absolute values. Lets say your data points are a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] y = np.abs(a) f = np.linspace(1,10,num=101) y = signal.lfilter([1, -f], [1, f], file1_x) cbar = signal.cm.get_cmap('jet') plt.clf() plt.plot(f, y, 'b-', lw=2, c='red') plt.grid() plt.axis([0, 100, -5, 30]) plt.xlabel('Frequency [Hz]') plt.ylabel('Amplitude [dB]') plt.show() Plot Q: How does visual identification of text in a picture relate to language identification? I have a pretty simple question I have not been able to find an answer to so far.
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