#14180: SatSolver.clauses
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Reporter: malb | Owner: jason
Type: PLEASE CHANGE | Status: needs_info
Priority: major | Milestone: sage-5.8
Component: misc | Resolution:
Keywords: sat, cryptominisat | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Martin Albrecht | Merged in:
Dependencies: #14198 | Stopgaps:
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Comment (by ncohen):
> `clauses()` does not accept any input file, only a file to write
'''to''' (?)
Oops right. I meant : when you read `self._tail`. The parsing only creates
clauses with `is_xor` set to `False` :
{{{
clauses.append( ( tuple(clause), False, None ) )
}}}
Hence the output of `clauses` never returns a clause with `is_xor = True`.
Oh. But may it be because there is actually no way to create a xor clause
with te DIMACS interface ?
> !CryptoMiniSat expresses xor clauses by prefixing them with an "x" and
flipping the last clause if the right hand side if false.
Oh. Weird. Thanks `:-)`
> A `gens()` method needs doctstring, doctests etc. This way, everything
is in place automatically. I added the alias `gens()` for `clauses()`
because Sage users are used to `gens()` as the method to return the
generators.
?
Well, why wouldn't you just write `gens = clauses` then ? `O_o`
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14180#comment:9>
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