#12649: Bug in initialisation of species
-----------------------------+----------------------------------------------
Reporter: hivert | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: combinatorics | Keywords: Species
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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The following specification is valid:
{{{
sage: Set0 = species.SetSpecies()
sage: Set1 = species.SetSpecies(min=1)
sage: Set2 = species.SetSpecies(min=2)
sage: Four = species.CombinatorialSpecies()
sage: Four.define(Set2(Four) + Set1*Set0(Four))
}}}
However, the following code breaks
{{{
sage: Four.generating_series()[1]
[...]
ValueError: generator already executing
}}}
Strangely enough, adding some seemingly unrelated instruction work
around it::
{{{
sage: Set0 = species.SetSpecies()
sage: Set1 = species.SetSpecies(min=1)
sage: Set2 = species.SetSpecies(min=2)
sage: Set2(Set1).generating_series()[1]
0
sage: Four = species.CombinatorialSpecies()
sage: Four.define(Set2(Four) + Set1*Set0(Four))
sage: Four.generating_series()[1]
1
sage: Four.generating_series()[4]
52/3
sage: Four.generating_series()
x + 2*x^2 + 16/3*x^3 + 52/3*x^4 + O(x^5)
}}}
Florent
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12649>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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