#563 integrate(1/x^5,x,1,2^(1/78))

closed
nobody
Lisp Core (471)
5
2006-03-13
2004-04-24
No

In addition to bug 938235, here is another similar bug.
I did these calculations after applying my gfactor
patch. These are okay:

(C2) integrate(1/x^5,x,1,sqrt(2));
(D2) 3/16

(C3) integrate(1/x^5,x,1,2^(1/23));
(D3) (2^(4/23)-1)/(4*2^(4/23))

But we get a quotient by zero error for

(C4) integrate(1/x^5,x,1,2^(1/78));
QUOTIENT by ZERO

Changing gcd and algebraic doesn't help

(C5) algebraic : true$
(C6) gcd : 'spmod$
(C7) integrate(1/x^5,x,1,2^(1/78));
QUOTIENT by ZERO

(C8) build_info();

Maxima version: 5.9.0.1cvs
Maxima build date: 13:6 4/24/2004
host type: i686-pc-mingw32
lisp-implementation-type: Kyoto Common Lisp
lisp-implementation-version: GCL 2.7.0

Barton

Discussion

  • Robert Dodier

    Robert Dodier - 2005-08-22

    Logged In: YES
    user_id=501686

    For these examples I don't get "quotient by 0" but I do get
    an incorrect result ...

    integrate(1/x^5,x,1,2^(1/78)); => 0

    algebraic : true$
    gcd : 'spmod$
    integrate(1/x^5,x,1,2^(1/78)); => 0

    Maxima version: 5.9.1.1cvs
    Maxima build date: 22:27 8/19/2005
    host type: i686-redhat-linux-gnu
    lisp-implementation-type: CLISP
    lisp-implementation-version: 2.33.2 (2004-06-02)

    also

    Maxima version: 5.9.1.1cvs
    Maxima build date: 10:35 8/20/2005
    host type: @host@
    lisp-implementation-type: GNU Common Lisp (GCL)
    lisp-implementation-version: GCL 2.6.6

     
  • Robert Dodier

    Robert Dodier - 2005-08-22
    • labels: --> Lisp Core
     
  • Raymond Toy

    Raymond Toy - 2006-03-13
    • status: open --> closed
     
  • Raymond Toy

    Raymond Toy - 2006-03-13

    Logged In: YES
    user_id=28849

    Maxima now returns the correct answer.

     

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