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circuit(1) Scilab function circuit(1)
NAME
circuit - finds a circuit or the rank function in a directed graph
CALLING SEQUENCE
[p,r] = circuit(g)
PARAMETERS
g : graph list
p : row vector of integer numbers of the arcs of the circuit if it exists
r : row vector of rank function if there is no circuit
DESCRIPTION
circuit tries to find a circuit for the directed graph g. It returns the
circuit p as a row vector of the corresponding arc numbers if it exists and
it returns the empty vector [] otherwise. If the graph has no circuit, the
rank function is returned in r, otherwise its value is the empty vector [].
EXAMPLE
// graph with circuit
ta=[1 1 2 3 5 4 6 7 7 3 3 8 8 5];
he=[2 3 5 4 6 6 7 4 3 2 8 1 7 4];
g=make_graph('foo',1,8,ta,he);
g('node_x')=[116 231 192 323 354 454 305 155];
g('node_y')=[ 118 116 212 219 117 185 334 316];
show_graph(g);
p=circuit(g)
show_arcs(p)
// graph without circuit
g=make_graph('foo',1,4,[1 2 2 3],[2 3 4 4]);
[p,r]=circuit(g)
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