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nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve)) (1 viewing) (1) Guests

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TOPIC: nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

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#7880

Will Ness (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))
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#7881

Daniel Fischer (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

not a code, anyway, and actually running it is ridiculous. Postponed filters version, is the one to be used as a reference point of the basic _code_, precisely because it _does_ use the primes squares optimization, which _is_ essential to any basic sieve.

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#7882

Daniel Fischer (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

And seeing that this overly-complicated (IMO), steps-jumping PQ-_base_d code was sold to us as the only faithful rendering of the sieve, I wanted to see for myself whether this really holds water. I can understand that very well.

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#7883

Will Ness (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

Turner's sieve should have been always looked at as just a specification, not a code, anyway, and actually running it is ridiculous. Postponed filters version, is the one to be used as a reference point of the basic _code_, precisely because it _does_ use the primes squares optimization, which _is_ essential to any basic sieve. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe <at haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe _______________________________________________ Haskell-Cafe mailing list This e-mail address is being protected from spam bots, you need JavaScript enabled to view it http://www.haskell.org/mailman/listinfo/haskell-cafe

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#7884

Will Ness (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

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#7885

Daniel Fischer (Visitor)

nt factor FASTER primes (was: Re: Code and Perf. Data for Prime Finders (was: Genuine Eratosthenes sieve))

or primes = 2: 3: sieve [] (tail primes) 5 where sieve fs (p

s) x = [i | i<- [x,x+2..q-2], a!i] ++ sieve ((2*p,q):fs') ps (q+2) where q = p*p mults = [ [y+s,y+2*s..q] | (s,y)<- fs] fs' = [ (s,last ms) | ((s,_),ms)<- zip fs mults] a = accumArray (a b-False) True (x,q-2) [(i,()) | ms<- mults, i<- ms] Umm, really? I'd think if you see what that does, you won't have difficulties with a mutable array sieve.

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