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Automatically calculating skew   Message List  
Reply | Forward Message #2417 of 2468 |
Re: Automatically calculating skew

--- In ggnfs@yahoogroups.com, "Serge Batalov" <batalovs@...> wrote:
>
> --- In ggnfs@yahoogroups.com, "chris2be8" <chris2be8@> wrote:
> > It replaces:
> > die("Error: 'skew' not supplied!\n") unless ($SKEW);
> >
> > with:
> > unless ($SKEW) { ...
>
> Ok, makes sense. Except that it doesn't have to flipped.
> It is always (|c0|/|cn|)**(1/n) (i.e. can be less than 1).
> I'll post it.
>
> Thanks. --Serge
>

ggnfs-doc.pdf page 17 says "It should be at least 1". So I assumed I should
invert the result if less than 1.

At least that's was the "Draft of February 8, 2007" by Chris Monico says.

Chris K





Sun Jun 21, 2009 12:21 pm

chris2be8
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Message #2417 of 2468 |
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Hello, I've written a patch for factMsieve.pl to automatically calculate skew if it isn't provided in the .poly file for a SNFS job. It should also work for...
chris2be8
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Jun 19, 2009
7:05 pm

... Ok, makes sense. Except that it doesn't have to flipped. It is always (|c0|/|cn|)**(1/n) (i.e. can be less than 1). I'll post it. Thanks. --Serge...
Serge Batalov
batalovs
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Jun 20, 2009
8:09 pm

... ggnfs-doc.pdf page 17 says "It should be at least 1". So I assumed I should invert the result if less than 1. At least that's was the "Draft of February 8,...
chris2be8
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Jun 21, 2009
3:44 pm

... The skew being larger than 1 is a good rule of thumb, and is especially useful becase the rest of the code assumes relations will have an 'a' coordinate...
Jason Papadopoulos
jasonp@...
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Jun 21, 2009
10:07 pm
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