#17559: load_session loses variable's latex_name
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Reporter: wonder | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: pickling | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Saving and loading variables apparently doesn't reload the `latex_name`
attribute:
{{{
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.4.1, Release Date: 2014-11-23 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: xhat = SR.symbol( 'xhat', latex_name='\hat{x}' )
sage: latex(xhat)
\hat{x}
sage: save_session( 'xhat' )
sage: l = load( 'xhat.sobj' )
sage: latex( l['xhat'] )
\hat{x}
sage:
Exiting Sage (CPU time 0m0.20s, Wall time 2m49.25s).
}}}
{{{
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.4.1, Release Date: 2014-11-23 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: l = load( 'xhat.sobj' )
sage: latex( l['xhat'] )
\mathit{xhat}
}}}
It looks as if it tries to keep these objects unique, and `load()` will
leave an existing variable's `latex_name` in place, but won't set it when
creating a variable.
I can see arguments for and against considering `SR.symbol('x',
latex_name='y')` a different variable from `SR.symbol('x')`. It seems
reasonable to consider them the same, in which case the latex name should
be discarded if there's already a variable of the same name. But it
should use the saved latex name when loading a variable that isn't already
defined.
Seems possibly related: #5466
--
Ticket URL: <http://trac.sagemath.org/ticket/17559>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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