ergm_state: A Representation of ERGM state

Description

ergm_state is a family of semi-internal classes for passing around results of MCMC sampling, particularly when the result is used to start another MCMC sampler. It is deliberately loosely specified, and its structure and even name are subject to change.

Usage

ergm_state(x, ...)
# S3 method for edgelist
ergm_state(
  x,
  nw0,
  model = NULL,
  proposal = NULL,
  stats = NULL,
  ext.state = NULL,
  ...
)
# S3 method for matrix
ergm_state(
  x,
  nw0,
  model = NULL,
  proposal = NULL,
  stats = NULL,
  ext.state = NULL,
  ...
)
# S3 method for network
ergm_state(x, ...)
is.ergm_state(x)
# S3 method for ergm_state
as.edgelist(x, ...)
# S3 method for ergm_state
as.matrix(x, matrix.type = NULL, ...)
# S3 method for ergm_state_full
as.network(x, ..., populate = TRUE)
# S3 method for ergm_state
network.edgecount(x, na.omit = TRUE, ...)
# S3 method for ergm_state_full
network.dyadcount(x, na.omit = TRUE, ...)
# S3 method for ergm_state_full
network.size(x, ...)
# S3 method for ergm_state
network.naedgecount(x, ...)
# S3 method for ergm_state_full
%ergmlhs%(lhs, setting)
# S3 method for ergm_state_full
%ergmlhs%(lhs, setting) <- value
# S3 method for ergm_state
as.rlebdm(x, ...)
# S3 method for ergm_state_send
as.ergm_model(x, ...)
# S3 method for ergm_state_send
is.curved(object, ...)
# S3 method for ergm_state_send
param_names(object, ...)
# S3 method for ergm_state_send
nparam(object, ...)
# S3 method for ergm_state_full
update(
  object,
  el = NULL,
  nw0 = NULL,
  model = NULL,
  proposal = NULL,
  stats = NULL,
  ext.state = NULL,
  state = NULL,
  ...
)
# S3 method for ergm_state
ergm_state(x, model = NULL, proposal = NULL, stats = NULL, ...)
ERGM_STATE_R_CHANGED
ERGM_STATE_C_CHANGED
ERGM_STATE_RECONCILED
ergm_state_send(x, ...)
# S3 method for ergm_state_send
ergm_state_send(x, ...)
# S3 method for ergm_state_full
ergm_state_send(x, ...)
# S3 method for ergm_state_receive
ergm_state_send(x, ...)
# S3 method for ergm_state_send
update(object, state, ...)
ergm_state_receive(x, ...)
# S3 method for ergm_state
ergm_state_receive(x, ...)
# S3 method for ergm_state_full
ergm_state_receive(x, ...)
# S3 method for ergm_state
summary(object, ...)

Value

At this time, an ergm_state object is (subject to change) a list containing some subset of the following elements, with el, ext.state, and ext.flag mandatory and others depending on how it is used:

el: a tibble edgelist representing the edge state of the network
nw0: a network object with all edges removed.
model: an ergm_model object.
proposal: an ergm_proposal object.
ext.state: a list of length equalling to the number of terms in the model.
ext.flag: one of ERGM_STATE_R_CHANGED, ERGM_STATE_C_CHANGED, and ERGM_STATE_R_RECONCILED.
stats: a numeric vector of network statistics or some other statistics used to resume.
uids: a named list of globally unique ID strings associated with a model and/or proposal; for the ergm_state_send and ergm_state_receive, these strings may be retained even if these values are set to NULL

Format

An object of class integer of length 1.

Arguments

...: Additional arguments, passed to further methods.
nw0: a network object, whose edges are absent or ignored.
model: an ergm_model object.
ext.state: a list equal to the number of terms in the model, providing the encoded extended state. This vector is usually generated by ext.encode() function of an ergm term, but it can be specified directly.
na.omit: Whether missing edges should be counted. Note that missing edge information is not stored.
state: An ergm_state to replace the state with.

Methods (by class)

ergm_state(edgelist): a method for constructing an ergm_state from an edgelist object and an empty network.
ergm_state(matrix): a method for constructing an ergm_state from a matrix object and an empty network.
ergm_state(network): a method for constructing an ergm_state from a network object. Note that ... arguments will be passed directly to the edgelist method.
ergm_state(ergm_state): a method for constructing an ergm_state.

Methods (by generic)

network.edgecount(ergm_state): Note that this method fails when na.omit=FALSE, since missing edges are not stored.
network.naedgecount(ergm_state): A stub that returns 0.
summary(ergm_state): a very low-level function that calculates summary statistics associated with an ergm_state object.

Functions

network.dyadcount(ergm_state_full): Note that this method fails with its default argument, since missing edges are not stored.
update(ergm_state_full): a method for updating an ergm_state and reconciling extended state.

Details

ergm_state is actually a hierarchy of classes, defined by what they can be used for. Specifically,

c(ergm_state_receive,ergm_state): needs to contain only el, ext.state, and ext.flag: it is the information that can change in the process of MCMC sampling; it is the one returned by the *_slave functions, to minimize the amount of data being sent between nodes in parallel computing.
c(ergm_state_send,ergm_state_receive,ergm_state): needs the above but also the model and the proposal: is needed to initiate MCMC sampling; it is the information required by the *_slave functions, again, to minimize the amount of data being sent between nodes in parallel computing.
c(ergm_state_full, ergm_state_send,ergm_state_receive,ergm_state): needs the above but also the nw0: is needed to reconstruct the original network.