func ExampleDistanceMatrix_NonNegative() {
d1 := cluster.DistanceMatrix{
{0, -1}, // false
{-1, 0},
}
d2 := cluster.DistanceMatrix{
{0}, // true
{1, 2},
}
d3 := cluster.DistanceMatrix{} // true (no negatives present)
d4 := cluster.DistanceMatrix{
{0, math.NaN()}, // true
{3, 0},
}
fmt.Println(d1.NonNegative())
fmt.Println(d2.NonNegative())
fmt.Println(d3.NonNegative())
fmt.Println(d4.NonNegative())
// Outpupt:
// false
// true
// true
// true
}
