Acquire and verify the network from the LHS of an ergm formula and verify that it is a valid network.
The function function ensures that the network in a given formula is valid; if so, the network is returned; if not, execution is halted with warnings.
ergm.getnetwork(formula, loopswarning = TRUE)
A network
object constructed by evaluating the LHS of
the model formula in the formula's environment.
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