Date: Tue, 23 Oct 2012 16:16:24 -0700 From: Gary Kline <kline@thought.org> To: Polytropon <freebsd@edvax.de> Cc: Olivier Nicole <olivier.nicole@cs.ait.ac.th>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: way way off topic Message-ID: <20121023231624.GF29440@ethic.thought.org> In-Reply-To: <20121023085249.5c742ccc.freebsd@edvax.de> References: <20121023042007.GA14738@ethic.thought.org> <CA%2Bg%2BBvgaYY-nh9d89a7ytf9RAgMSjFNHPh3GzNqNG0xPFEX9BQ@mail.gmail.com> <20121023085249.5c742ccc.freebsd@edvax.de>
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On Tue, Oct 23, 2012 at 08:52:49AM +0200, Polytropon wrote: > On Tue, 23 Oct 2012 11:31:18 +0700, Olivier Nicole wrote: > > Gary, > > > > On Tue, Oct 23, 2012 at 11:20 AM, Gary Kline <kline@thought.org> wrote: > > > > > > apologies up front for this math type quandary. I had it in a std C program, > > > but 3+ hours of grepping havent found it. I would have bet my last cent that I > > > had a summary Somewhere, but cant find that either. > > > > > > here is the problem as best I can remember it. > > > > > > > > > let's say that john is 8 and his older friend, jim, is 22. > > > how much older is exact percentage terms is jim? > > > > That should be 22/8=2.75 > > Jim is 275% older than John > > Jim is 175% _older_. Why? Because 100% older means 16 years, > as 100% refers to 8 years (8+8=16, 200% older is 8+8+8=24). > Percentage is always a reference to something else, in this > question, Jim's age in relation to John's. The word "older" > means "adding percentage", refering to the base value of 8, > "divided in 100 parts" (floating point considerations aside), > to finally reach the value 22. > > If the question would be different, say, "What's the percentage > of John's age regarding Jim's age?" In that case, it would be > 8/22=0.3636 being 36%. Obvious: John's age is approximately > 1/3 of Jim's age. > > The easiest way for creating the proper calculation is to refer > to the equation > > percentage * 100 > percentage value = ---------------- > base value > > and resolve it to whatever is required. > I just took a cup's worth of coffee/caffeine to bring me back up! but it seems to me that your logic is about the same as I remember otherwise stated in getting the true differences in ages or speeds [say or cars. x == 200clicks/hr, y == 400 clicks/hour.] or *whatever*. it isn't as easy as it would seem at first thought. > -- > Polytropon > Magdeburg, Germany > Happy FreeBSD user since 4.0 > Andra moi ennepe, Mousa, ... -- Gary Kline kline@thought.org http://www.thought.org Public Service Unix Twenty-six years of service to the Unix community.
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