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predecessors

Node predecessors

Syntax

preIDs = predecessors(G,nodeID)

Description

example

preIDs = predecessors(G,nodeID) returns the predecessor nodes of the node in directed graph G specified by nodeID. The predecessor nodes form directed edges with preIDs as the source nodes, and nodeID as the target node.

Examples

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Create and plot a directed graph and determine the predecessor nodes of node 'e'.

s = [1 1 1 2 2 3 3 7 8];
t = [2 3 4 5 6 7 8 5 5];
names = {'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h'};
G = digraph(s,t,[],names);
plot(G)

preIDs = predecessors(G,'e')
preIDs = 3x1 cell array
    {'b'}
    {'g'}
    {'h'}

Input Arguments

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Input graph, specified as a digraph object. Use digraph to create a directed graph object.

Example: G = digraph([1 2],[2 3])

Node identifier, specified as a numeric scalar node index or a character vector node name.

Example: preIDs = predecessors(G,3) finds the predecessor nodes of node 3.

Output Arguments

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Predecessor node IDs, returned as a numeric scalar or column vector of node indices, or as a cell array of character vectors containing node names.

  • If nodeID is a numeric node index, then preIDs contains numeric node indices.

  • If nodeID is a node name, then preIDs contains node names.

Introduced in R2015b

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