5 May
2008
5 May
'08
3:10 p.m.
John Maddock wrote:
So, it looks like so far we have:
next(val) prior(val)
and either of
representation_distance(a, b); discrete_distance(a, b);
I'm still a bit unhappy about calling a signed quantity a "distance". I would prefer "difference". Let me elaborate: To me a "distance" is a quantity that satisfies the rules: d(x,y) >= 0 d(x,x) = 0 d(y,x) = d(x,y) d(x,y) + d(y,z) >= d(x,z) while a "difference" is a quantity that satisfies the rules d(x,x) = 0 d(y,x) = -d(x,y) d(x,y) + d(y,z) = d(x,z) The function we are discussing satisfies the second set of rules. --Johan