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I'm old. I get confused. OK?


Aug
31
comment What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
That's looking pretty good. I fudged the 2 factor to 2.5 (moved the 0.5 point to about 55), added a small linear component (to get closer to 100), and the capped the result at 99.9. It's smooth and "looks right", at least to my eyes (can never guess what the customer will think). I'll call it good.
Aug
31
comment What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
I'll take a look at it, right after I finish wrestling with a different alligator.
Aug
31
comment What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
Well, actually I was getting f(32) = 99, and hoping for something closer to f(50) or f(75) = 99. But thanks -- I'll look at your formula
Aug
31
comment What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
x can never be less than zero. I can cap in the 100-200 range, though. Obviously, if y approaches 100 then there's no precision to be lost in larger x values.
Aug
31
awarded  Supporter
Aug
31
comment What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
Yeah, I'm looking at that. 100*(1 - exp(x*7/50)) comes close, but, while x=0.5 yields roughly 50 (which I want), we get to 99 at around x=32, whereas I'd like it to be closer to x=50 or 75. So I'm open to some other "simple" equations.
Aug
31
asked What's the simplest curve that has an inflection point at zero and is asymptotic at 100.0?
Aug
17
awarded  Scholar
Aug
17
accepted Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
Aug
17
awarded  Commentator
Aug
17
comment Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
Well, I'm going to give Didier the "answer", since he's contributed a lot. I'd still like to hear a few other ideas, though.
Aug
10
revised Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
added 142 characters in body
Aug
10
revised Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
added 218 characters in body
Aug
10
comment Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
Hmmm.... There was a third answer that went away before I could work through it.
Aug
9
revised Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
added 656 characters in body
Aug
9
revised Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
added 656 characters in body
Aug
9
comment Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
@Ross Millikan -- Looks good, thanks!
Aug
9
comment Need mathematical function for “adding” 0.5 and 0.5 and getting 0.4
@Ross Millikan -- Correct, which is why it doesn't extend nicely above 1.0.
Aug
9
comment Number of even numbers with sum of digits less than 12
(I never was that good at math.)
Aug
9
comment Number of even numbers with sum of digits less than 12
Ah, missed that point too.