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annotate ch5ex6-3.py @ 46:d83a72eec954

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Forgot to add these. Needed for Chapter 6.
author Brian Neal <bgneal@gmail.com>
date Thu, 25 Jul 2013 21:27:36 -0500
parents 305cc03c2750
children
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bgneal@36 1 """Chapter 5.5, exercise 6 in Allen Downey's Think Complexity book.
bgneal@36 2
bgneal@36 3 3. Use the BA model to generate a graph with about 1000 vertices and compute the
bgneal@36 4 characteristic length and clustering coefficient as defined in the Watts and
bgneal@36 5 Strogatz paper. Do scale-free networks have the characteristics of
bgneal@36 6 a small-world graph?
bgneal@36 7
bgneal@36 8 """
bgneal@36 9
bgneal@36 10 from ch5ex6 import BAGraph
bgneal@36 11
bgneal@36 12 g = BAGraph(5, 5)
bgneal@36 13
bgneal@36 14 for i in xrange(1000):
bgneal@36 15 g.step()
bgneal@36 16
bgneal@36 17 g.set_edge_length(1)
bgneal@36 18 print "Clustering coefficient:", g.clustering_coefficient()
bgneal@36 19 print "Characteristic length:", g.big_l3()