From: prj@po.cwru.edu (Paul Jarc)
Subject: sorting by a partial order
Date: Tue, 29 Oct 2002 15:33:59 -0500 [thread overview]
Message-ID: <m3of9drnle.fsf@multivac.cwru.edu> (raw)
I have a two-place predicate that defines a partial order (i.e., it is
possible that neither is A less than B nor is B less than A). I want
to sort a sequence of items according to that predicate, so that if A
occurs before B in the result, then B is not less than A according to
the predicate.
* Can sort, stable-sort, sort-list, etc., deal with a partial order
for the less procedure, or must it be a full ordering?
* How do these procedures behave if, by mistake, the ordering
predicate (consistently) returns contradictory results? (A is less
than B, and B is less than A.)
* My predicate is actually not quite a partial order because it is not
transitive. Is there any existing code for constructing the
transitive closure of a relation?
TIA
paul
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next reply other threads:[~2002-10-29 20:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-29 20:33 Paul Jarc [this message]
2002-10-30 3:23 ` sorting by a partial order Thien-Thi Nguyen
2002-10-30 6:34 ` Keith Wright
2002-10-30 7:27 ` Thien-Thi Nguyen
2002-10-30 7:43 ` Thien-Thi Nguyen
2002-10-30 17:12 ` Paul Jarc
2002-10-31 10:22 ` rm
2002-10-31 17:41 ` Paul Jarc
2002-11-06 13:12 ` Mikael Djurfeldt
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