norm vs size

chris2be8 · 2015-09-11, 16:00

Hello,

I've been comparing what msieve says about a poly during GNFS poly selection and what it says during -nc. Eg:

Code:

 # norm 1.023739e-12 alpha -6.751675 e 5.557e-11 rroots 5
skew 942118.35, size 8.466e-13, alpha -6.752, combined = 5.557e-11 rroots = 5

alpha, e/combined and rroots match, but does the norm relate to the size score? The ones I've looked at norm is a bit larger than the size, but I don't know if that's always true.

Chris

jasonp · 2015-09-13, 02:24

The two size-based scores are calculated differently; the first score above accounts for the skew, while the second one has a more complex definition and is independent of skew. For the first one, smaller is better, but for the second one larger is better.

2015-09-11, 16:00	#1
chris2be8 Sep 2009 2·1,213 Posts	norm vs size Hello, I've been comparing what msieve says about a poly during GNFS poly selection and what it says during -nc. Eg: Code: # norm 1.023739e-12 alpha -6.751675 e 5.557e-11 rroots 5 skew 942118.35, size 8.466e-13, alpha -6.752, combined = 5.557e-11 rroots = 5 alpha, e/combined and rroots match, but does the norm relate to the size score? The ones I've looked at norm is a bit larger than the size, but I don't know if that's always true. Chris

2015-09-13, 02:24	#2
jasonp Tribal Bullet Oct 2004 3²·5·79 Posts	The two size-based scores are calculated differently; the first score above accounts for the skew, while the second one has a more complex definition and is independent of skew. For the first one, smaller is better, but for the second one larger is better. Last fiddled with by jasonp on 2015-09-13 at 02:25

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Max FFT Size?	aketilander	Software	44	2018-12-19 17:58
Pi(x) value for x at 10^16 size	edorajh	Computer Science & Computational Number Theory	6	2017-03-08 20:28
NFS: Sieving the norm over ideals vs. integers	paul0	Factoring	2	2015-01-19 11:52
FFT-Size	andi314	Lounge	14	2007-01-22 00:21
NFS and smooth norm MOD N ?	bonju	Factoring	9	2005-08-26 13:29