def main():
"""Defines assets, creates portfolios, and displays a scatter plot
of the different portfolios"""
s1 = Instrument(0.01, 0.01, "Asset 1", "Equity")
s2 = Instrument(0.02, 0.02, "Asset 2", "Bond")
s3 = Instrument(0.03, 0.03, "Asset 3", "Commodity")
s4 = Instrument(0.04, 0.04, "Asset 4", "Equity")
p1 = Portfolio([s1, s2])
p2 = Portfolio([s1, s3])
p3 = Portfolio([s1, s4])
p4 = Portfolio([s2, s3])
p5 = Portfolio([s2, s4])
p6 = Portfolio([s3, s4])
p1.addcorr([[0, -0.1]])
p2.addcorr([[0, -0.1]])
p3.addcorr([[0, -0.1]])
p4.addcorr([[0, -0.1]])
p5.addcorr([[0, -0.1]])
p6.addcorr([[0, -0.1]])
c = Chart([p1, p2, p3, p4, p5, p6], 0.004)
c.scatters(size=3)
