frag.get.layers.pair {archeofrag}

Extracts the subgraph corresponding to a pair of stratigraphic layers.

Description

Extracts the subraph corresponding to a pair of stratigraphic layers (or any other type of archaeological spatial unit).

Usage

frag.get.layers.pair(graph, layer.attr, sel.layers, size.mini=2,
                     mixed.components.only=FALSE)

Arguments

graph

An igraph object.

layer.attr

Character. The name of the vertices attribute giving the layer of each fragment.

sel.layers

A numeric vector of length 2 with the name of the stratigraphic layer selected for extraction.

size.mini

A minimal number of vertices for the components to include in the resulting graph.

mixed.components.only

Logical. If TRUE, only the components with fragments from the two selected layers are returned. If FALSE, all the components of the two layers are extracted.

Details

The default setting of the mixed.components.only argument is FALSE, for convenience for other measurements.

Value

An undirected graph object.

Author(s)

Sebastien Plutniak <sebastien.plutniak at posteo.net>

Examples

g <- frag.simul.process(n.components=20, vertices=50, disturbance=.15)
igraph::V(g)$layers <- c(rep("layer1", 20), rep("layer2", 20), rep("layer3", 10))

frag.get.layers.pair(g, "layers", sel.layers=c("layer2","layer3"),
                     size.mini=2, mixed.components.only=FALSE)
frag.get.layers.pair(g, "layers", sel.layers=c("layer2","layer3"),  
                     size.mini=2, mixed.components.only=TRUE)