import matplotlib.pyplot as plt
from numpy import arange
import sk_dsp_comm.sigsys as ss
t = arange(0,1,1/1024.)
# a 20% duty cycle pulse starting at t = 0
x_rect = ss.rect(t-.1,0.2)
Xk, fk = ss.fs_coeff(x_rect,25,10)
# plot the spectral lines
ss.line_spectra(fk,Xk,'mag')
plt.show()