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 fast accurate Kneser sexp algorithm sheldonison Long Time Fellow Posts: 664 Threads: 23 Joined: Oct 2008 09/05/2011, 01:07 PM (This post was last modified: 11/21/2011, 09:33 PM by sheldonison.) (09/05/2011, 05:05 AM)sheldonison Wrote: (09/04/2011, 08:16 PM)JmsNxn Wrote: Sheldon, I'm wondering if I'm doing something wrong here, but whenever I try to plot anything with this function: Code:V(a,b,t) = {   if (real(t)<1,  return(exp2(t,exp2(-t,a)+exp2(-t,b))));   if (real(t)>=1, return(exp2(t,exp2(-t,a)+exp2(-1,b)))); } exp2(t, a) = {   if (a==2, return(2));   if (a == 4, return(4));   if (real(a)>2, return(superf(isuperf(a)+t)), return(superf2(isuperf2(a)+t))); } I repeatedly get a cryptic Win32 error: Code:gp 4852 child_copy: linked dll data write copy failed This is my proposed "natural" extension to the Ackermann function, I'm confused as to why it won't plot. I appreciate any help you can give me, thanks.I'll take a look.... you're probably using base sqrt(2), which has two different superfunction solutions and fixed points of 2 and 4. I'll post some more after I do some experiments for base sqrt(2), along with your routine. - ShelI wasn't able to reproduce the error you saw, but I think I know what the problem is. sqrt(2)2, return(superf(isuperf(a)+t)), return(superf2(isuperf2(a)+t))); } ploth(t=1.5,5,z=exp2(2,t);[real(z),imag(z)]); ploth(t=1.5,5,z=exp2(-2,t);[real(z),imag(z)]);`For the most recent code version: go to the Nov 21st, 2011 thread. « Next Oldest | Next Newest »

 Messages In This Thread fast accurate Kneser sexp algorithm - by sheldonison - 08/07/2010, 06:53 AM The pari-GP code - by sheldonison - 08/07/2010, 09:17 PM RE: fast accurate Knesser sexp algorithm - by bo198214 - 08/08/2010, 03:54 PM RE: fast accurate Knesser sexp algorithm - by sheldonison - 08/08/2010, 06:46 PM RE: fast accurate Kneser sexp algorithm - by nuninho1980 - 08/15/2010, 12:09 AM updated kneser.gp code - by sheldonison - 08/19/2010, 02:35 AM RE: updated kneser.gp code - by nuninho1980 - 08/19/2010, 12:08 PM RE: updated kneser.gp code - by sheldonison - 08/20/2010, 01:05 AM RE: fast accurate Kneser sexp algorithm - by sheldonison - 10/14/2010, 10:00 PM RE: fast accurate Kneser sexp algorithm - by nuninho1980 - 10/15/2010, 04:03 PM RE: fast accurate Kneser sexp algorithm - by sheldonison - 10/15/2010, 09:20 PM kneser.gp modified for large bases - by sheldonison - 10/19/2010, 03:33 AM small update to allow more flexibility, faster - by sheldonison - 10/30/2010, 09:47 PM update to support B

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