Karim Belabas on Mon, 17 Jun 2013 11:24:00 +0200

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Re: Ploth function

* Ha Tran [2013-06-13 09:42]:
> I have a problem in using the function "ploth"  in pari gp.
> Actually, I need to compute a infinite sums:
> ff(x,vp,re,wp)=log
> (sum(s1=-\infinity,\infinity,sum(s2=-\infinity,\infinity,
> exp(g(x,vp,re,wp))))
>  for a<x<b;
> and with the accuracy epsilon =10^(-5), by using a function to limit this
> sum, let call limitshortvec(x,vp,re), I have the bounds of s1 and s2 (lis1
> and lis2), then I define:
> ff(x,vp,re,wp)=limitshortvec(x,vp,re);log
> (sum(s1=-lis1,lis1,sum(s2=-lis2,lis2, exp(g(x,vp,re,wp))))  for
> a<x<b;
> Finally, I have to "link" these functions "ff"" together, for example:
> h(x)=if(a<=x &&x<=b,ff(x,vp1,re1,wpr1),if(b<x &&x<=c,ff(x,vp2,re2,wpr2)))
> then plot h:
> ploth(x=a,c,h(x))
> then Pari gp gives an announcement:
> â1347953757 [main] gp 6648 child_copy: linked dll data write copy failed,
> 0x2CC000..0x2CF1B0, done 0, windows pid 6648, Win32 error 487â

I have never seen this message in relation to PARI/GP. :-(

(in other contexts, it's related to the --enable-auto-image-base gcc flag,
which I thought was a thing of the past)

1) What exact version of Pari are you using. I.e. what is the exact name 
of the binary you installed ?

2) In case this is not the one you used, please try to reproduce the problem


3) Can you send me the complete GP script in a separate file, including the
limitshortvec() function ? Please make the example minimal: it should contain
no code that's not absolutely necessary for you to reproduce the problem.
Just reading in the file in the gp interpreter should trigger the bug.


Karim Belabas, IMB (UMR 5251)  Tel: (+33) (0)5 40 00 26 17
Universite Bordeaux 1          Fax: (+33) (0)5 40 00 69 50
351, cours de la Liberation    http://www.math.u-bordeaux1.fr/~kbelabas/
F-33405 Talence (France)       http://pari.math.u-bordeaux1.fr/  [PARI/GP]