#16758: FiniteStateMachine.composition: check types
-------------------------------------+-------------------------------
Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: finite state machines | Keywords: composition
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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The output of an automaton should not be feedable into a transducer
(because there is none); when composing an automaton with a transducer,
the result should be an automaton.
The aim would be:
{{{
sage: from sage.combinat.finite_state_machine import (
....: is_Automaton, is_Transducer)
sage: T = Transducer([(0, 0, 0, 0)], initial_states=[0])
sage: A = Automaton([(0, 0, 0)], initial_states=[0])
sage: T.composition(A, algorithm='direct')
Traceback (most recent call last):
...
TypeError: Composition with automaton is not possible.
sage: T.composition(A, algorithm='explorative')
Traceback (most recent call last):
...
TypeError: Composition with automaton is not possible.
sage: A.composition(A, algorithm='direct')
Traceback (most recent call last):
...
TypeError: Composition with automaton is not possible.
sage: A.composition(A, algorithm='explorative')
Traceback (most recent call last):
...
TypeError: Composition with automaton is not possible.
sage: is_Automaton(A.composition(T, algorithm='direct'))
True
sage: is_Automaton(A.composition(T, algorithm='explorative'))
True
}}}
I'll prepare a patch.
--
Ticket URL: <http://trac.sagemath.org/ticket/16758>
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