Tests if a graph represented by an adjacency matrix is connected.
An adjacency matrix. Must be a numeric matrix with non-negative entries.
Idea by Ed Scheinerman, circa 2006. Source: http://www.ams.jhu.edu/~ers/matgraph/; routine: matgraph/@graph/isconnected.m
FALSE depending on whether
the graph represented in
adj is a connected graph.
Lei Zhao, firstname.lastname@example.org
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