bugAxiom Computer Algebra System - Bugs: bug #10312, Problems raising a UTS to a...

 
 

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bug #10312: Problems raising a UTS to a negative integer power

Submitter:  Martin Rubey <kratt6>
Submitted:  Tue 07 Sep 2004 02:28:57 PM UTC
   
 
Category:  algebra Severity:  3 - Normal
Priority:  5 - Normal Item Group:  code bug
Status:  Fixed Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Closed Release: 
Reproducibility:  None Fixed Release:  November 2008
Error message: 

 >> Error detected within library code:
   ** rational power of coefficient undefined

protected-symbol-warn called with (NIL)

Example of code trigerring the bug: 

p:=(1/2+n)::UTS(FRAC INT, 'n, 0)
(p**(-1))$UTS(FRAC INT, 'n, 0)

Internal cause: 


Discussion

Wed 08 Sep 2004 09:09:58 AM UTC, comment #1: 

resolved in patch #3349

Martin Rubey <kratt6>
Tue 07 Sep 2004 02:28:57 PM UTC, original submission:  

The code below raises an unnecessary error. The problem
is in sttaylor.spad/powern, where no distinction between rational and integer powers are made.

The fix is easy. In fact, I just realize that the problem does not exist in SUPS, so we can just take the definition there. I'll submit a patch tomorrow.


Martin Rubey <kratt6>

 

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    History

    Follow 8 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2008-11-25 axiom Statustransferred Fixed
        Open/ClosedOpen Closed
        Fixed Release November 2008
    2008-11-25 axiom Assigned tobillpage1 None
    2005-01-22 billpage1 StatusNone transferred
    2004-12-28 billpage1 Assigned toNone billpage1
        Error message &gt;&gt; Error detected within library code: ** rational power of coefficient undefined protected-symbol-warn called with (NIL) >> Error detected within library code: ** rational power of coefficient undefined protected-symbol-warn called with (NIL)
        Example of code trigerring the bugp:=(1/2+n)::UTS(FRAC INT, 'n, 0) (p**(-1))$UTS(FRAC INT, 'n, 0) p:=(1/2+n)::UTS(FRAC INT, 'n, 0) (p**(-1))$UTS(FRAC INT, 'n, 0)

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