When you specify the array x and X you need to make sure it is of complex data type, i.e:
x = zeros((4),dtype=complex)
EDIT:
To fix the plot you need to plot both real and imaginary parts:
plt.plot(X.real,X.imag) plt.plot(fx.real,fx.imag, 'ro')
This gives me:
….which looks like your Matlab graph.
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