#10275: matrix output strangeness for cached methods
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Reporter: jhpalmieri | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: linear algebra | Keywords:
Author: John Palmieri | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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From [http://groups.google.com/group/sage-
devel/browse_thread/thread/60ce4391e54e74be?tvc=2 sage-devel]: Something
is not quite right in the cleverness used to output matrices:
{{{
sage: M
76 x 58 dense matrix over Integer Ring (type 'print M.str()' to see all of
the entries)
sage: M.hermite_form()
76 x 58 dense matrix over Integer Ring (type 'print hnf-True-False.str()'
to see all of the entries)
}}}
This issue arises with methods which cache their results (like
hermite_form), whereas other methods (like transpose) work the way they're
supposed to. The proposed fix:
- in the function {{{sage_variablename}}} which tries to get the name of
an object, only return strings which are valid identifiers for Python
objects.
- then in the caching methods for matrices, make sure the keys are not
valid identifiers by appending a symbol like "$".
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10275>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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