def plot_ema(self, n, p, linestyle):
temp = []
for i in range(n):
temp.append(i**p)
mask = list(reversed([float(x)/sum(temp) for x in temp]))
self.ema = np.convolve(self.signal[:,1], mask, mode='valid')
print len(self.ema)
print len(self.tstamps)
self.plt.plot(self.tstamps[n-1:], self.ema, linestyle, linewidth=1.7)
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