intensitynet: Constructor of the class intensitynet.

In intensitynet: Intensity Analysis of Spatial Point Patterns on Complex Networks

Constructor of the class intensitynet.

Description

This constructor creates an intensitynet object using an adjacency matrix, the coordinates of the nodes and the coordinates of the events.

Usage

intensitynet(
  adjacency_mtx,
  node_coords,
  event_data,
  graph_type = c("undirected", "directed", "mixed"),
  event_correction = 5
)

Arguments

adjacency_mtx	Network adjacency matrix
node_coords	Nodes latitude and longitude matrix (coordinates)
event_data	DataFrame with event latitude and longitude coordinates (mandatory columns) and optional attributes related to the events
graph_type	Network type: 'undirected' (default), 'directed' or 'mixed'
event_correction	Value that determines how far can be an event to be considered part of a segment (default 5). This value highly depends on the given coordinate system

Value

intensitynet class object containing: graph = <igraph>, events = <matrix>, graph_type = c('directed', 'undirected', 'mixed'), distances = <matrix>, event_correction = <integer>, events_related = <boolean>

Examples

library(spatstat)
data(chicago)
chicago_df <- as.data.frame(chicago[["data"]]) # Get as dataframe the data from Chicago

# Get the adjacency matrix. One way is to create an igraph object from the edge coordinates.
edges <- cbind(chicago[["domain"]][["from"]], chicago[["domain"]][["to"]])
chicago_net <- igraph::graph_from_edgelist(edges)

# And then use the igraph function 'as_adjacency_matrix'
chicago_adj_mtx <- as.matrix(igraph::as_adjacency_matrix(chicago_net))
chicago_node_coords <- data.frame(xcoord = chicago[["domain"]][["vertices"]][["x"]], 
                                 ycoord = chicago[["domain"]][["vertices"]][["y"]])
                                  
# Create the intensitynet object, in this case will be undirected 
intnet_chicago <- intensitynet(chicago_adj_mtx, 
                               node_coords = chicago_node_coords, 
                               event_data = chicago_df)

intensitynet documentation built on April 11, 2023, 6:07 p.m.