Function write_pajek 

pub fn write_pajek<W: Write>(
    graph: &Graph,
    labels: Option<&[String]>,
    weights: Option<&[f64]>,
    writer: &mut W,
) -> IgraphResult<()>

Write a graph in Pajek (.net) format.

Writes *Vertices section (with optional labels), then *Edges (undirected) or *Arcs (directed) section with optional weights.

When labels is None, falls back to the "name" vertex attribute if present. When weights is None, falls back to the "weight" edge attribute if present.

Examples

use rust_igraph::{Graph, write_pajek, AttributeValue};

let mut g = Graph::with_vertices(3);
g.add_edge(0, 1).unwrap();
g.add_edge(1, 2).unwrap();
g.set_vertex_attribute_all("name", vec![
    AttributeValue::String("A".into()),
    AttributeValue::String("B".into()),
    AttributeValue::String("C".into()),
]).unwrap();

let mut buf = Vec::new();
write_pajek(&g, None, None, &mut buf).unwrap();
let s = String::from_utf8(buf).unwrap();
assert!(s.contains("*Vertices 3"));
assert!(s.contains("\"A\""));
assert!(s.contains("*Edges"));