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.TH contract_edge 1 "September 1996" "Scilab Group" "Scilab function"
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contract_edge - contracts edges between two nodes
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g1 = contract_edge(i,j,g)
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: integer, number of start or end node of edge
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: integer, number of end or start node of edge
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: graph list of the new graph
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\fVcontract_edge\fR returns the graph \fVg1\fR, the edges between the nodes
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number \fVi\fR and \fVj\fR being deleted, the nodes being reduced to one
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node with the same name as node \fVi\fR and located at the middle point
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between the 2 previous nodes.
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ta=[1 1 2 2 2 3 4 5 5 7 8 8 9 10 10 10 10 10 11 12 13 13 13 14 15 16 16 17 17];
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he=[2 10 3 5 7 4 2 4 6 8 6 9 7 7 11 13 13 15 12 13 9 10 14 11 16 1 17 14 15];
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g=make_graph('foo',1,17,ta,he);
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g('node_x')=[283 163 63 57 164 164 273 271 339 384 504 513 439 623 631 757 642];
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g('node_y')=[59 133 223 318 227 319 221 324 432 141 209 319 428 443 187 151 301];
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g1=contract_edge(10,13,g);
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add_edge, add_node, delete_arcs, delete_nodes