#19296: Generating function in FindStat interface
-------------------------------------+-------------------------------------
Reporter: stumpc5 | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.9
Component: packages: | Resolution:
optional | Merged in:
Keywords: FindStat, OEIS | Reviewers: Martin Rubey
Authors: Christian Stump | Work issues: document
Report Upstream: N/A | Commit:
Branch: | 1fe70f7eaa757c9c2cf1bdde415bce9e22d3fb15
u/mantepse/generating_function_in_findstat_interface| Stopgaps:
Dependencies: |
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Changes (by stumpc5):
* status: positive_review => needs_info
Comment:
Sorry to get back to this, but {{{if len(set(all_elements)) !=
len(all_elements)}}} assumes the elements to be hashable.
FindStat internally this is totally fine, but that makes the following,
very natural, findstat search fail:
{{{
sage: findstat( { g:g.wiener_index() for g in Graphs(4) if
g.is_connected() } )
---------------------------------------------------------------------------
...
TypeError: This graph is mutable, and thus not hashable. Create an
immutable copy by `g.copy(immutable=True)`
}}}
It will obviously take much longer to do the uniqueness test in a list,
but I guess it's worth it. What do you think?
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Ticket URL: <http://trac.sagemath.org/ticket/19296#comment:67>
Sage <http://www.sagemath.org>
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