convertNodePair {ppsbm}R Documentation

Convert node pair (i,j)

Description

Convert node pair (i,j) into an index in \{1,\dots,N\} where N=n(n-1) (directed case) or N=n(n-1)/2 (undirected case).

Usage

convertNodePair(i, j, n, directed)

Arguments

i

Node i : i\in \{1, \ldots, n\}

j

Node j : j\in \{1, \ldots, n\}

n

Total number of nodes, 1\le i \le n

directed

Boolean for directed (TRUE) or undirected (FALSE) case

Details

Interacting individuals (i,j) must be encoded into integer values in \{1,\dots,N\} in describing the data.

Directed case :
  • The node pair (i,j) with (i\neq j) is converted into the index (i-1)*(n-1)+j-(i<j)

Undirected case :
  • The node pair (i,j) with (i\neq j) is converted into the index (2*n-i)*(i-1)/2 +j-i

The number of possible node pairs is

which corresponds to the range of values for data$type.seq

Value

Index corresponding to the node pair

Examples

# Convert the node pair (3,7) into an index, where the total number of nodes is 10,
# for directed and undirected interactions

i <- 3
j <- 7
n <- 10

directedIndex <- convertNodePair(i,j,n,TRUE)
undirectedIndex <- convertNodePair(i,j,n,FALSE)


[Package ppsbm version 1.0.0 Index]