Description Usage Arguments Details Value
takes an adjacency matrix and generates the incidencematrix
| 1 | adj_to_inc(adj)
 | 
| adj | an adjacency matrix | 
the incidence matrix E has entry e_{ij} equal to
1 if an edge starts in node i and finishes in j
-1 if an edge ends in node i and finishes in j
0 if nodes i and j are not connected
an incidence matrix
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