# scipy.signal.windows.boxcar

scipy.signal.windows.boxcar(M, sym=True)

  Return a boxcar or rectangular window.

  Also known as a rectangular window or Dirichlet window, this is equivalent to no window at all.

  Parameters:
    M int

      Number of points in the output window. If zero, an empty array is returned. An exception is thrown when it is negative.

    sym bool, optional

      Whether the window is symmetric. (Has no effect for boxcar.)

  Returns:
    w ndarray

      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]")