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- Path: sparky!uunet!gatech!concert!borg!cs.unc.edu!morse
- From: morse@cs.unc.edu (Bryan Morse)
- Newsgroups: comp.programming
- Subject: Re: Does "400% faster" make sense? (Was: Re: finding 1st one in integer)
- Message-ID: <14186@borg.cs.unc.edu>
- Date: 27 Jul 92 20:10:10 GMT
- References: <1992Jul22.120735@is.morgan.com> <LOWRY.92Jul22154231@rotor.watson.ibm.com> <1992Jul22.172337@is.morgan.com> <KERS.92Jul23082251@cdollin.hpl.hp.com>
- Sender: news@cs.unc.edu
- Lines: 31
-
- In article <KERS.92Jul23082251@cdollin.hpl.hp.com>, kers@hplb.hpl.hp.com (Chris Dollin) writes:
- |> Surely 75% faster means at 75/100 == 3/4 of the speed, ie 4/3 ~= 133% of the
- |> time, ie *slower*?
-
- Not quite. 75% *as fast* does mean 3/4 of the speed. 75% *faster*
- means 175% or 7/4 of the speed.
-
- Think of it this way:
- I am running at 100% of my speed (obviously).
- You are running 75% faster or 100% + 75% = 175% of my speed.
-
- Or another example:
-
- I am driving at 50 mph.
- You are driving at 55 mph.
-
- You are going 55-50 = 5 mph faster than me.
- 5 mph is 10% of my speed.
- Therefore, you are going 10% (of my speed) faster than me.
-
- I am going 5 mph slower than you.
- 5 mph is approximately 9% (1/11) of your speed.
- Therefore, I am going approximately 9% (of your speed) slower than you.
-
- The lack of symmetry between faster and slower has lead some (e.g.,
- Hennessy and Patterson) to choose only to refer to the faster one as
- XX% faster than the slower one, never the other way around.
-
- --
- Bryan Morse University of North Carolina at Chapel Hill
- morse@cs.unc.edu Department of Computer Science
-