[Maxima-bugs] [ maxima-Bugs-1392182 ] polynomial factoring fails

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Bugs item #1392182, was opened at 2005-12-28 11:45
Message generated for change (Comment added) made by robert_dodier
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Category: Lisp Core
Group: None
>Status: Closed
>Resolution: Works For Me
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: polynomial factoring fails

Initial Comment:
factor(x^4-y^4)
factor(x^5+y^5)

Maxima 5.9.2 http://maxima.sourceforge.net
Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL)
Distributed under the GNU Public License. See the file
COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function
bug_report()
provides bug reporting information.
(%i1) factor(x^3-y^3);
 
Error in FACTOR [or a callee]:
Error in TYPE-ERROR-DATUM [or a callee]: The slot
CONDITIONS::DATUM is unbound in the object
#<CONDITIONS::INTERNAL-TYPE-ERROR.0>.

Please contct pw...@cs... to obtain
the polymomial package "ppack" that can be included
in maxima for distribution.

Paul

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>Comment By: Robert Dodier (robert_dodier)
Date: 2006-08-14 20:55

Message:
Logged In: YES 
user_id=501686

Not observed in 5.9.3.99rc1. Closing this report as "works
for me".

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Comment By: Barton Willis (willisbl)
Date: 2005-12-29 17:34

Message:
Logged In: YES 
user_id=895922

I don't have this problem with 5.9.2.10cvs:

(%i1) factor(x^3-y^3);
(%o1) -(y-x)*(y^2+x*y+x^2)
(%i2) factor(x^4-y^4);
(%o2) -(y-x)*(y+x)*(y^2+x^2)
(%i3) factor(x^5+y^5);
(%o3) (y+x)*(y^4-x*y^3+x^2*y^2-x^3*y+x^4)
(%i4) build_info();
Maxima version: 5.9.2.10cvs
Maxima build date: 12:57 12/20/2005
host type: i686-pc-mingw32
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.7
(%o4) 

Barton

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Comment By: Barton Willis (willisbl)
Date: 2005-12-29 17:33

Message:
Logged In: YES 
user_id=895922

I don't have this problem with 5.9.2.10cvs:

(%i1) factor(x^3-y^3);
(%o1) -(y-x)*(y^2+x*y+x^2)
(%i2) factor(x^4-y^4);
(%o2) -(y-x)*(y+x)*(y^2+x^2)
(%i3) factor(x^5+y^5);
(%o3) (y+x)*(y^4-x*y^3+x^2*y^2-x^3*y+x^4)
(%i4) build_info();
Maxima version: 5.9.2.10cvs
Maxima build date: 12:57 12/20/2005
host type: i686-pc-mingw32
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.7
(%o4) 

Barton

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