SimInf (version 11.1.0)

SimInf_events-class: Class SimInf_events

Description

Class to hold data for scheduled events that modify the discrete state of individuals in a node at a pre-defined time t.

Slots

E

The select matrix (sparse matrix of class dgCMatrix). Each row corresponds to a model compartment.

• Sampling (Exit, Internal/External Transfer): Non-zero entries in a column indicate which compartments individuals are sampled from. The values in E[, select] act as weights for sampling individuals without replacement (probability proportional to weight).

• Targeting (Enter): Non-zero entries in a column indicate which compartments new individuals are added to. The values in E[, select] act as weights for distributing new individuals among the target compartments.

N

The shift matrix (integer matrix). Determines how individuals are moved between compartments during enter, internal transfer, and external transfer events.

• Each row corresponds to a source compartment.

• Each column corresponds to a specific shift value.

• If q <- shift, the entry N[p, q] defines the offset (number of rows to move) for individuals sampled from compartment p.

• The destination compartment is calculated as: destination = p + N[p, q].

• Constraint: 1 <= destination <= number of compartments.

event

Integer vector specifying the event type for each row:

• 0: exit (remove individuals).

• 1: enter (add individuals).

• 2: internal transfer (move within node).

• 3: external transfer (move between nodes).

Other values are reserved for future use.

time

Integer vector specifying the time step when each event occurs.

node

Integer vector specifying the source node for the event. For external transfer, this is the node individuals are moved from. Range: 1 <= node <= number of nodes.

dest

Integer vector specifying the destination node for external transfer events (individuals moved to). For other event types, this value is ignored (typically set to 0). Range: 1 <= dest <= number of nodes.

n

Integer vector specifying the number of individuals affected by the event. Must be n >= 0.

proportion

Numeric vector. If n[i] == 0, the number of individuals is sampled from a binomial distribution using proportion[i] and the current population size in the selected compartments. Range: 0 <= proportion <= 1.

select

Integer vector specifying which column of the matrix E to use for sampling/targeting for each event. The specific individuals are chosen based on the non-zero entries in E[, select[i]].

shift

Integer vector specifying which column of the matrix N to use for shifting individuals for each event. Unused for exit events.

See Also

SimInf_model for the main model class that holds the events. SIR, SEIR, SIS, SISe for examples of how events are passed to model constructors. SimInf_model (constructor) for details on the E and N matrices used to define event behavior. run for executing the simulation with scheduled events. Vignette "Scheduled events" for detailed examples of defining and using events.