Target Layout (focal-node, topological) — layout

Port of qgraph's flow() layout. One node of interest (the target) is placed alone, then every other node is drawn in successive levels ordered by unweighted graph distance (BFS hops) from it. This shows how the target node connects out into the rest of the network.

Usage

layout_target(network, target = NULL, horizontal = TRUE, equalize = TRUE, ...)

Arguments

network: A CographNetwork or cograph_network object.
target: Node of interest, given as a label (character) or 1-based index. When NULL (default) the highest-degree node is used.
horizontal: Logical. If TRUE (default) levels flow left to right with the target node on the left; if FALSE they flow top to bottom.
equalize: Logical. If TRUE (default) nodes are evenly spaced within each level.
...: Additional arguments (ignored).

Value

Data frame with x, y coordinates, one row per node.

Details

Unlike qgraph's implementation, weights are binarized for layering (only connectivity matters) and disconnected nodes are placed in an extra trailing level instead of raising an error.

Examples

adj <- matrix(c(0, 1, 1, 0, 1, 0, 0, 1,
                1, 0, 0, 0, 0, 1, 0, 0), nrow = 4, byrow = TRUE)
net <- CographNetwork$new(adj)
layout_target(net, target = 1)
#>   x         y
#> 1 0 0.5000000
#> 2 1 0.3333333
#> 3 1 0.6666667
#> 4 2 0.5000000