scipy.signal.windows.
boxcar#
- scipy.signal.windows.boxcar(M, sym=True)[source]#
- Return a boxcar or rectangular window. - Also known as a rectangular window or Dirichlet window, this is equivalent to no window at all. - Parameters:
- Mint
- Number of points in the output window. If zero, an empty array is returned. An exception is thrown when it is negative. 
- symbool, optional
- Whether the window is symmetric. (Has no effect for boxcar.) 
 
- Returns:
- wndarray
- The window, with the maximum value normalized to 1. 
 
 - Examples - Plot the window and its frequency response: - >>> import numpy as np >>> from scipy import signal >>> from scipy.fft import fft, fftshift >>> import matplotlib.pyplot as plt - >>> window = signal.windows.boxcar(51) >>> plt.plot(window) >>> plt.title("Boxcar window") >>> plt.ylabel("Amplitude") >>> plt.xlabel("Sample") - >>> plt.figure() >>> A = fft(window, 2048) / (len(window)/2.0) >>> freq = np.linspace(-0.5, 0.5, len(A)) >>> response = 20 * np.log10(np.abs(fftshift(A / abs(A).max()))) >>> plt.plot(freq, response) >>> plt.axis([-0.5, 0.5, -120, 0]) >>> plt.title("Frequency response of the boxcar window") >>> plt.ylabel("Normalized magnitude [dB]") >>> plt.xlabel("Normalized frequency [cycles per sample]")   