ergm: lasttoggle – R documentation

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lasttoggle

Storing last toggle information in a network

Description

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.

Usage

ergm.el.lasttoggle(nw)

to.matrix.lasttoggle(nw)

to.lasttoggle.matrix(m, directed = TRUE, bipartite = FALSE)

Arguments

`nw`	the network, otpionally with a `"lasttoggle"` network attribute.
`m`	a sociomatrix of appropriate dimension (rectangular for bipartite networks).
`directed, bipartite`	whether the matrix represents a directed and/or a bipartite networks.

Details

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:

list("time"): the time stamp associated with the network
list("lasttoggle"): 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.

Functions

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.

ergm

Fit, Simulate and Diagnose Exponential-Family Models for Networks

v3.11.0

GPL-3 + file LICENSE

Authors

Mark S. Handcock [aut], David R. Hunter [aut], Carter T. Butts [aut], Steven M. Goodreau [aut], Pavel N. Krivitsky [aut, cre] (<https://orcid.org/0000-0002-9101-3362>), Martina Morris [aut], Li Wang [ctb], Kirk Li [ctb], Skye Bender-deMoll [ctb], Chad Klumb [ctb], Michał Bojanowski [ctb], Ben Bolker [ctb]

Initial release

2020-10-14