flag-algebra

An implementation of Flag algebras.

Example

```rust extern crate flag_algebra;

use flag_algebra::*; use crate::sdp::Problem; use crate::flags::Graph; use crate::operator::Basis;

pub fn main() { // Work on the graphs of size 3. let basis = Basis::new(3);

// Define useful flags. let k3 = flag(&Graph::new(3, &[(0,1),(1,2),(2,0)])); // Triangle let e3 = flag(&Graph::new(3, &[])); // Independent set of size 3

// Definition of the optimization problem. let pb = Problem:: { // Constraints ineqs: vec!(totalsumisone(basis), flagsarenonnegative(basis)), // Use all relevant Cauchy-Schwarz inequalities. cs: basis.allcs(), // Minimize density of triangle plus density of independent of size 3. obj: k3 + e3, };

// Write the correspondind SDP program in "goodman.sdpa". // This program can then be solved by CSDP. pb.write_sdpa("goodman").unwrap(); } ```

License: GPL-3.0