File: circuit.sci

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scilab 2.6-4
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function [p,r]=circuit(g)
// Copyright INRIA
[lhs,rhs]=argn(0)
if rhs<>1 then error(39), end
// check g
check_graph(g)
// compute lp, la and ls
n=g('node_number')
ma=prod(size(g('tail')))
if g('directed')==1 then
  [lp,la,ls]=m6ta2lpd(g('tail'),g('head'),n+1,n)
else
  error('The graph must be directed')
end
// compute rank function
[i,r]=m6frang(lp,ls,n)
if i==0 then p=[]
else p=m6prevn2p(i,i,r,la,lp,ls,g('directed')), r=[]
end