|McLaughlin, James on Mon, 08 Dec 2003 19:02:30 +0100|
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|RE: bnrisprincipal to slow|
Actually, I was running it on 2 machines. My home machine running version 2.2.6 completed the operation sometime during the night and took something over 3 days. I was also running it on a computer at my old university, which has version 2.1.4 installed system wide and this is the one where the computations are in the 9th day. -----Original Message----- From: McLaughlin, James Sent: Mon 12/8/2003 5:34 AM To: Karim BELABAS; pari-users list Cc: Subject: RE: bnrisprincipal to slow How does GP/PARI CALCULATOR Version 2.2.6 (development CHANGES-1.756) i386 running cygwin (ix86 kernel) 32-bit version compiled: May 28 2003, gcc-3.2 20020927 (prerelease) (readline v4.3 enabled, extended help available) compare with version 2.2.7? I am trying to find a set of fundamental units for the field generated by a degree 37 polynomial (discriminant 10^36*37^37) and it has been running for about 8 days now. A similar computation for a polynomial of degree 31 took about a day. I am wondering if version 2.2.7 would speed things up considerably or perhaps the computations have run into some kind of loop? My code for this is: n=37; a=(x + 2*I)^n; b=(x - 2*I)^n; f= round ( real( (a + b)/2 - (a - b)/(4*I) )) ; print([n,f]); fus= bnfinit( f,1).fu ; print("fus="); print(fus); Jimmy Mc Laughlin. First make absolutely sure you are using the CVS version of PARI [ headers should read something like GP/PARI CALCULATOR Version 2.2.7 (development CHANGES-1.873) with possibly a slightly lower patchlevel. ] The development version is orders of magnitude faster than the stable ones (2.1.*) for algebraic number theory (and a few other things).