#10275: matrix output strangeness for cached methods
------------------------------+---------------------------------------------
Reporter: jhpalmieri | Owner: jason, was
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-4.7.3
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: Julian Rueth | Author: John Palmieri
Merged: | Dependencies:
------------------------------+---------------------------------------------
Changes (by saraedum):
* status: needs_work => needs_review
Old description:
> 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 "$".
New description:
From [http://groups.google.com/group/sage-
devel/browse_thread/thread/60ce4391e54e74be?tvc=2 sage-devel]: Something
is not quite right in the cleverness used to output matrices:
{{{
sage: M
76 x 58 dense matrix over Integer Ring (type 'print M.str()' to see all of
the entries)
sage: M.hermite_form()
76 x 58 dense matrix over Integer Ring (type 'print hnf-True-False.str()'
to see all of the entries)
}}}
This issue arises with methods which cache their results (like
hermite_form), whereas other methods (like transpose) work the way they're
supposed to. The proposed fix:
- in the function {{{sage_variablename}}} which tries to get the name of
an object, only return strings which are valid identifiers for Python
objects.
- then in the caching methods for matrices, make sure the keys are not
valid identifiers by appending a symbol like "$".
----
Apply [attachment:trac_10275_doctest.patch] to the sage repository.
--
Comment:
Apply trac_10275_doctest.patch
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10275#comment:6>
Sage <http://www.sagemath.org>
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