Ticket #1132 (closed defect: wontfix)

Opened 1 year ago

Last modified 3 weeks ago

error inverting matrix over RQDF

Reported by: mhansen Assigned to: was
Priority: major Milestone: sage-duplicate/invalid/wontfix
Component: linear algebra Keywords:
Cc:

Description

I've attached b.sobj which you can load to reproduce the error. 

sage: ~b
---------------------------------------------------------------------------
<type 'exceptions.ZeroDivisionError'>     Traceback (most recent call last)

/home/mike/<ipython console> in <module>()

/home/mike/matrix0.pyx in sage.matrix.matrix0.Matrix.__invert__()

<type 'exceptions.ZeroDivisionError'>: self is not invertible
sage: c = b.change_ring(RDF)
sage: ~c

[ 0.0277777777778  0.0277777777778  0.0277777777778  0.0277777777778  0.0277777777778  0.0277777777778]
[  0.111111111111  -0.111111111111  0.0555555555556 -0.0555555555556  0.0555555555556 -0.0555555555556]
[             0.0              0.0  0.0962250448649  0.0962250448649 -0.0962250448649 -0.0962250448649]
[            -0.0             -0.0  0.0962250448649 -0.0962250448649 -0.0962250448649  0.0962250448649]
[  0.111111111111   0.111111111111 -0.0555555555556 -0.0555555555556 -0.0555555555556 -0.0555555555556]
[ 0.0277777777778 -0.0277777777778 -0.0277777777778  0.0277777777778 -0.0277777777778  0.0277777777778]

Attachments

b.sobj (472 bytes) - added by mhansen on 11/08/2007 07:52:09 PM.

Change History

11/08/2007 07:52:09 PM changed by mhansen

  • attachment b.sobj added.

12/18/2007 01:12:28 AM changed by mabshoff

  • milestone changed from sage-2.10 to sage-2.9.1.

12/22/2007 09:21:22 AM changed by mhansen

This is due to the following: 

sage: b = load('/home/mike/Desktop/b.sobj')
sage: A = b.augment(b.parent().identity_matrix())
sage: B = A.echelon_form()
sage: B[5,5]
1.000000000000000000000000000000000000000000000000000000000000000
sage: B[5,5] == 1
False

12/29/2007 09:44:52 AM changed by mabshoff

This ought to be solved. Maybe it is fodder fir Bug Day 8.

Cheers,

Michael

11/13/2008 09:38:44 PM changed by mabshoff

  • status changed from new to closed.
  • resolution set to wontfix.
  • milestone changed from sage-3.2.1 to sage-duplicate/invalid/wontfix.

Wontfix since we will remove RQDF - see #3762.

Cheers,

Michael