Scilab function

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.

### 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];
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);
```