An informal extension to network objects allowing
some limited temporal information to be stored.
WARNING: THIS DOCUMENTATION IS PROVIDED AS A COURTESY, AND THE API
DESCRIBED IS SUBJECT TO CHANGE WITHOUT NOTICE, DOWN TO COMPLETE
REMOVAL. NOT ALL FUNCTIONS THAT COULD SUPPORT IT DO. USE AT YOUR
OWN RISK.
ergm.el.lasttoggle(nw)to.matrix.lasttoggle(nw)
to.lasttoggle.matrix(m, directed = TRUE, bipartite = FALSE)
the network, otpionally with a "lasttoggle" network
attribute.
a sociomatrix of appropriate dimension (rectangular for bipartite networks).
whether the matrix represents a directed and/or a bipartite networks.
ergm.el.lasttoggle: Returns a 3-column matrix whose first two
columns are tails and heads of extant edges and whose third
column are the creation times for those edges.
to.matrix.lasttoggle: Returns a numeric sociomatrix whose values
are last toggle times for the corresponding dyads.
to.lasttoggle.matrix: Serializes a matrix of last toggle times
into the form used by C code.
While networkDynamic provides a flexible,
consistent method for storing dynamic networks, the C routines of
ergm and
tergm required a simpler and more
lightweight representation.
This representation consisted of a single integer representing the
time stamp and an integer vector of length to
network.dyadcount(nw) --- the number of potential
ties in the network, giving the last time point during which each
of the dyads in the network had changed.
Though this is an API intended for internal use, some functions,
like stergm (for EGMME),
simulate, and
summary can be passed networks with
this information using the following network (i.e.,
%n%) attributes:
the time stamp associated with the network
a
vector of length network.dyadcount(nw), giving the
last change time associated with each dyad. See the source code of
ergm internal functions
to.matrix.lasttoggle, ergm.el.lasttoggle, and
to.lasttoggle.matrix for how they are serialized.
For technical reasons, the tergm
routines treat the lasttoggle time points as shifted by
\(-1\).
Again, this API is subject to change without notice.