#19659: Poset: inverse function of ordinal_sum()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.0
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/develop | 01f9e1c6bb502e6044181c856bcb8984718fd237
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:20 ncohen]:
> Oh right, I had not noticed this 'for/else' problem. If you prefer, you
can also do something like:
>
> {{{
> #!python
> if (all(self.degree_out(l) == len(upper) for l in lower) and
> all(set(self.neighbors_out(l)) != upper for l in lower):
> cut_points.append(e)
> }}}
Is this any more clear? I think that if the code needs clarification,
first step would be adding comments. But at least the basic idea is quite
clearly said in docstring.
If I do
{{{
all(self.degree_out(l) == len(upper) for l in lower)
}}}
then `len(upper)` will be called many times.
--
Ticket URL: <http://trac.sagemath.org/ticket/19659#comment:21>
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