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#!/usr/bin/python
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# 4.3
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import pylab as pl
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z = pl.array([[0],[5./12]])
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p = pl.array([[1./2],[1./3]])
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def zplane(z, p):
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pl.figure(figsize=(8,8))
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x = pl.linspace(-1.5, 1.5)
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pl.plot(pl.zeros_like(x), x, 'b.', x, pl.zeros_like(x), 'b.', markersize=2)
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x = pl.linspace(0, 2*pl.pi, 100)
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pl.plot(pl.cos(x), pl.sin(x), 'b.', markersize=2)
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pl.plot(z, pl.zeros_like(z), 'ro', p, pl.zeros_like(p), 'rx', markersize=8)
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pl.xlabel('Real part')
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pl.ylabel('Imaginary part')
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zplane(z, p)
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pl.show()
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