#2956: generic multivariate polynomials are buggy on exponent overflow
------------------------------+---------------------------------------------
Reporter: cwitty | Owner: somebody
Type: defect | Status: new
Priority: major | Milestone: sage-3.2
Component: basic arithmetic | Resolution:
Keywords: |
------------------------------+---------------------------------------------
Comment (by zimmerma):
For the 2nd example, I do not get a crash, but a funny result with 3.1.4
on a 32-bit computer:
{{{
sage: K.<x,y> = ZZ[]
sage: (x^12345)^54321
x^28393*y^10232
}}}
Note that y does not appear in the input!
Possible explanation: 12345*54321 = 10232*2^16+28393.
Apparently the low 16 bits are used to store the exponent of x, and the
upper 16 bits
for the exponent of y, but no check for overflow is done!!!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2956#comment:2>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en
-~----------~----~----~----~------~----~------~--~---
