subKEGGgraph: Subset KEGG graph, including subsetting node and edge attributes

Description

subKEGGgraph extends generic method subGraph and subsets the KEGG graph. Both 'subKEGGgraph' and 'subGraph' can be used to subset the graph, the difference lies in whether the node and edge attributes from KEGG are also subset (subKEGGgraph) or not (subGraph).

See details below.

Usage

subKEGGgraph(nodes, graph)

Arguments

nodes

Node names to subset

graph

A graph parsed from KGML files, produced by parseKGML2Graph, KEGGpathway2Graph or parseKGMLexpandMaps

Value

A graph with nodeData and edgeData.

Details

subGraph does not subset the node or edge attributes, hence the results of getKEGGnodeData and getKEGGedgeData does not map to the nodes and edges in the subgraph in a one-to-one manner, with attributes of removed nodes and edges still remaining in the subGraph.

subKEGGgraph calls subGraph first to subset the graph, and then it also subsets the KEGGnodeData and KEGGedgeData so that they are one-to-one mapped to the nodes and edges in the subgraph.

Examples

Run this code

sfile <- system.file("extdata/hsa04010.xml",package="KEGGgraph")
gR <- parseKGML2Graph(sfile,expandGenes=TRUE)
subs <-  c("hsa:1432",edges(gR)$`hsa:1432`,"hsa:5778","hsa:5801",
"hsa:84867","hsa:11072","hsa:5606","hsa:5608","hsa:5494","hsa:5609")
gR.keggsub <- subKEGGgraph(subs, gR)
gR
gR.keggsub