#8264: swap_row does not work on modular matrices
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Reporter: janwil123 | Owner: was
Type: defect | Status: new
Priority: major | Milestone:
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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For some reason, swap_row does not work if the elements of the matrix are
treated as integers modulo something. The code to reproduce the bug is the
following:
{{{
A = matrix(ZZ, 2,[1,2,3,4])
B = copy(A)
B.swap_rows(0,1)
print B,'\n'
B.swap_columns(0,1) # So far so good
print B,'\n'
C = A.apply_map(lambda x:mod(x,8))
C.swap_rows(0,1) # This line does not work
print C,'\n'
C.swap_columns(0,1) # But this one does
print C
}}}
The bug reproduces every time on Mac OSX 10.6, SAGE version 4.3.1.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8264>
Sage <http://www.sagemath.org>
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