contract_edge
contract_edge — contracts edges between two nodes
Calling sequence
g1 = contract_edge(i,j,g)
Parameters
| i | : integer, number of start or end node of edge |
| j | : integer, number of end or start node of edge |
| g | : graph list |
| g1 | : graph list of the new graph |
Description
contract_edge returns the graph g1, the edges between the nodes
number i and j being deleted, the nodes being reduced to one
node with the same name as node i and located at the middle point
between the 2 previous nodes.
Examples
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];
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];
g=make_graph('foo',1,17,ta,he);
g('node_x')=[283 163 63 57 164 164 273 271 339 384 504 513 439 623 631 757 642];
g('node_y')=[59 133 223 318 227 319 221 324 432 141 209 319 428 443 187 151 301];
show_graph(g);
g1=contract_edge(10,13,g);
show_graph(g1,'new');
See also
add_edge, add_node, delete_arcs, delete_nodes
