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Bug #199

CFApprox: division by zero

Added by Anna Maria Bigatti almost 12 years ago. Updated almost 12 years ago.

Status:
Closed
Priority:
Normal
Assignee:
John Abbott
Category:
Maths Bugs
Target version:
CoCoALib-0.9952
Start date:
29 Jun 2012
Due date:
% Done:

100%

Estimated time:
0.75 h
Spent time:
0.75 h

Description

/**/ CFApprox(-0.51, 1/10);
***************************************************************************
****CoCoA ERROR****  ErrCode: CoCoA::ERR::DivByZero
****CoCoA ERROR****  Message: Division by zero or by a zero-divisor
****CoCoA ERROR****  Context: BigRat(N1,N2)
****CoCoA ERROR****  File:    BigRat.C
****CoCoA ERROR****  Line:    99
***************************************************************************

I guess the problem is in ContFracIter::operator++
      myFrac = 1/(myFrac - myQuot); // strictly positive!

History

#1 Updated by John Abbott almost 12 years ago

  • % Done changed from 0 to 100

The bug was a consequence of when I changed the definition of integer division (from round towards -infinity to round towards zero).

I have added a new test-NumTheory3.C specifically for this bug.

#2 Updated by John Abbott almost 12 years ago

  • Status changed from New to Closed

I forgot to close the issue and to count CVS time etc.

#3 Updated by Anna Maria Bigatti almost 12 years ago

  • Assignee set to John Abbott
  • Target version set to CoCoALib-0.9952
  • Estimated time set to 0.75 h

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