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Fig. 6.3 Drawings obtained from 2004 international interconnections and US migration networks
by: ( a , b )GEM( Frick et al. , 1995 )and( c , d )GRIP( Gajer & Kobourov , 2002 ; Gajer et al. , 2004 )
those from GRIP. For instance, in Fig. 6.3 b, one can see two large components that
split the US migration networks into two regions while no such phenomenon is
observed in Fig. 6.3 d. Actually, these two regions correspond to groups of western
and eastern states of the United States.
When dealing with reasonable size networks (several hundred or thousand
elements), it seems that the classical force-directed approaches are preferable to
the fast force-directed ones, because they offer better results in terms of aesthetic
criteria and they emphasize more information. On the contrary, when dealing with
large networks, one should use fast force-directed algorithms because they offer
much better computation times.
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