[PD] external / abstraction to get the difference between subsequent floats

[B. Bogart]

Hey all,

Before I make one, is there an abs/ext out there that prints the
difference between subsequent floats?

1,2,3,4,5 -> 1,1,1,1
2,4,6,8 -> 2,2,2
5,9,30,5,7 -> 4,21,-25,2

Thanks,
.b.