tsort {RBGL} | R Documentation |
returns vector of zero-based indices of vertices of a DAG in topological sort order
tsort(x) # now x assumed to be Bioconductor graph graphNEL
x |
instance of class graphNEL from Bioconductor graph class |
calls to the topological_sort algorithm of BGL. will check in BGL whether the input is a DAG and return a vector of zeroes (of length length(nodes(x))) if it is not. Thus this function can be used to check for cycles in a digraph.
a numerical vector enumerating vertices in the topological sort sequence, 0-based
VJ Carey <stvjc@channing.harvard.edu>
data(FileDep) tsind <- tsort(FileDep) tsind FD2 <- FileDep # now introduce a cycle FD2 <- addEdge("bar_o", "dax_h", FD2, 1) tsort(FD2)