1 #!/usr/bin/python

     2 # 4.3

     3 

     4 import pylab as pl

     5 

     6 z = pl.array([[0],[5./12]])

     7 p = pl.array([[1./2],[1./3]])

     8 

     9 def zplane(z, p):

    10     pl.figure(figsize=(8,8))

    11     x = pl.linspace(-1.5, 1.5)

    12     pl.plot(pl.zeros_like(x), x, 'b.', x, pl.zeros_like(x), 'b.', markersize=2)

    13     x = pl.linspace(0, 2*pl.pi, 100)

    14     pl.plot(pl.cos(x), pl.sin(x), 'b.', markersize=2)

    15     pl.plot(z, pl.zeros_like(z), 'ro', p, pl.zeros_like(p), 'rx', markersize=8)

    16     pl.xlabel('Real part')

    17     pl.ylabel('Imaginary part')

    18 

    19 zplane(z, p)

    20 

    21 pl.show()