Jason Moxham on Sat, 04 Jul 2009 00:53:17 +0200


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Re: Some bugs?

----- Original Message ----- From: "Bill Allombert" <Bill.Allombert@math.u-bordeaux1.fr> 
To: <pari-dev@list.cr.yp.to>
Sent: Friday, July 03, 2009 5:45 PM
Subject: Re: Some bugs?



On Fri, Jul 03, 2009 at 04:45:28PM +0100, Jason Moxham wrote:



This seems to work on linux32 though. Could you compare the output of
polchebyshev(n,2) (for n=26..50) on cygwin and linux ?



Typical,  one of the machines I use for linux32 has no bison , the other


You can install bison if you need it.


one's network card has broken , and my main one is only booting the wrong
kernel :( , so here is a cygwin with no gmp which appears to work...



                GP/PARI CALCULATOR Version 2.4.2 (development)
          i686 running cygwin (ix86/GMP-4.2.1 kernel) 32-bit version

parisize = 4000000, primelimit = 500000
? polchebyshev(27,2)
%2 = 134217728*x^27 - 872415232*x^25 + 2516582400*x^23 - 4244635648*x^21
+ 46425
70240*x^19 - 3218161810*x^17 + 1657840932*x^15 - 592086047*x^13 +
144320973*x^11
- 23209513*x^9 + 2320951*x^7 - 130320*x^5 + 3393*x^3 - 26*x



                GP/PARI CALCULATOR Version 2.4.2 (development)
               i686 running cygwin (ix86 kernel) 32-bit version
? polchebyshev(27,2)
%2 = 134217728*x^27 - 872415232*x^25 + 2516582400*x^23 - 4244635648*x^21
+ 46425
70240*x^19 - 3451650048*x^17 + 1778122752*x^15 - 635043840*x^13 +
154791936*x^11
- 24893440*x^9 + 2489344*x^7 - 139776*x^5 + 3640*x^3 - 28*x


Theses results are different (the second is correct)
However I see that revision 9957 fixed a memory corruption bug in
polchebyshev(,2). This might explain the discrepancy.
If you want to be sure apply the patch given by 'svn diff -c 9957'.
But it is more important to focus on the SVN HEAD branch, because
2.4.2 is not supported.

Cheers,
Bill.


Thanks
The Sage project will be using Pari SVN HEAD for the Windows port so I can forget this as well :) 

Jason