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subgraph Scilab Group Scilab function subgraph
NAME
subgraph - subgraph of a graph
CALLING SEQUENCE
g1 = subgraph(v,ind,g)
PARAMETERS
v : row vector, numbers of nodes or edges
ind
: string, 'nodes' or 'edges'
g : graph list
g1 : graph list of the new graph
DESCRIPTION
subgraph returns the graph g1, built with the numbers given by the the
row vector v. If ind is the string 'nodes', g1 is built with the node
numbers given by v and the connected edges of these nodes in g. If ind
is the string 'edges', g1 is built with the edge numbers given by v and
the tail-head nodes of these edges in g. All the characteristics of the
old nodes and edges of g are preserved.
EXAMPLE
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];
g('edge_color')=modulo([1:(edge_number(g))],15)+1;
g('node_diam')=[1:(g('node_number'))]+20;
show_graph(g);
v=[2 3 4 5 17 13 10];
show_nodes(v);
g1=subgraph(v,'nodes',g);
show_graph(g1);
v=[10 13 12 16 20 19];
show_graph(g);
show_arcs(v);
g1=subgraph(v,'edges',g);
show_graph(g1);
SEE ALSO
add_edge, add_node, delete_arcs, delete_nodes, supernode
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