Creation of a Connectivity Matrix with a Link Table
A links table can easily be used to construct a connectivity matrix, a core
element for measuring accessibility. It can be achieved by using the simple
algorithm:
The values of all the cells Cij in the connectivity
matrix C are set to 0. The default assumption that nodes are not linked.
For each record of the links table, the link becomes a connection (value
of 1).
For each record of the links table, an inverted connection is created if
the link is bi-directional.