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

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

 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
with

http://pari.math.u-bordeaux1.fr/pub/pari/windows/Pari-2-6-0.exe

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.

Cheers,

K.B.
--
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]
`

```

• References: