func ExampleDistanceMatrix_Square() {
d1 := cluster.DistanceMatrix{
{0, 3},
{3, 0},
}
d2 := cluster.DistanceMatrix{}
d3 := cluster.DistanceMatrix{
{0},
{3, 0},
}
fmt.Println(d1.Square())
fmt.Println(d2.Square())
fmt.Println(d3.Square())
// Output:
// true
// true
// false
}
