bugAxiom Computer Algebra System - Bugs: bug #9968, problems with exponentiation of...


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bug #9968: problems with exponentiation of matrices

Submitter:  Martin Rubey <kratt6>
Submitted:  Wed 11 Aug 2004 10:35:11 AM UTC
Category:  interpreter Severity:  3 - Normal
Item Group:  code bug Status:  None
Privacy:  Public Assigned to:  None
Originator Name:  kratt6 Open/Closed:  Open
Release:  9.6.2004 Reproducibility:  None
Fixed Release: 
Error message: 

There should be an error message, instead a nonsense-result is spit out...

Example of code trigerring the bug: 

matrix([[0,0],[0,0]]) ^ 0.1
matrix([[0,0],[0,0]]) ^ x

Internal cause: 

Wed 11 Aug 2004 10:35:11 AM UTC, original submission:  

(1) -> matrix([[0,0],[0,0]]) ^ 0.1

   (1)  0.0
                                                                  Type: Float

(2) -> matrix([[0,0],[0,0]]) ^ x
   (2)  0
Type: Expression Integer

but (fortunately)

(3) matrix([[0,0],[0,1]]) ^ 0.1
   There are 4 exposed and 0 unexposed library operations named ^
      having 2 argument(s) but none was determined to be applicable.
      Use HyperDoc Browse, or issue
                                )display op ^
      to learn more about the available operations. Perhaps
      package-calling the operation or using coercions on the arguments
      will allow you to apply the operation.

   Cannot find a definition or applicable library operation named ^
      with argument type(s)
                               Matrix Integer

      Perhaps you should use "@" to indicate the required return type,
      or "$" to specify which version of the function you need.

So it seems to happen only with the zero matrix.

Martin Rubey <kratt6>


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  • -email is unavailable- added by axiom (Updated the item)

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2008-11-25 axiom Example of code trigerring the bugmatrix([[0,0],[0,0]]) ^ 0.1 matrix([[0,0],[0,0]]) ^ x matrix([[0,0],[0,0]]) ^ 0.1 matrix([[0,0],[0,0]]) ^ x

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