public static Span <N, T> Span <N, T>(this IPolyrand random, N length = default, Interval <T>?domain = null, Func <T, bool> filter = null)
where T : struct
where N : ITypeNat, new()
=> NatSpan.Load <N, T>(random.Span <T>((int)length.value, domain, filter));
public static Span <M, N, T> Span <M, N, T>(this IPolyrand random, M rows = default, N cols = default)
where T : struct
where M : ITypeNat, new()
where N : ITypeNat, new()
=> NatSpan.Load <M, N, T>(random.Span <T>(nfunc.muli(rows, cols)), rows, cols);
public static Span <M, N, T> Span <M, N, T>(this IPolyrand random, M rows, N cols, Interval <T> domain)
where T : struct
where M : ITypeNat, new()
where N : ITypeNat, new()
=> NatSpan.Load <M, N, T>(random.Span <T>(nfunc.muli(rows, cols), domain), rows, cols);
