Method visit

src/dbscan.rs:38–41

(&mut self, pos: usize)

    }

    fn visit(&mut self, pos: usize) {
        let visited = self.visited.get_mut(pos).unwrap();
        *visited = true;
    }

    fn neighbours(&self, pos: usize) -> Vec<usize> {
        let p = self.data.get(pos).unwrap();