#15875: Add is_induced_subposet
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Reporter: csar | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: posets | Merged in:
Authors: Jori Mäntysalo | Reviewers: Travis Scrimshaw,
Report Upstream: N/A | Nathann Cohen
Branch: | Work issues:
u/jmantysalo/is_subposet | Commit:
Dependencies: | fb6299eec28a317a64bfc38b8474c816d06cdc35
| Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:63 ncohen]:
> I do not understand the point of the line `if not hasattr(other,
'hasse_diagram'):`. Given that you call `subposet` and `.hasse_diagram` on
`other` anyway your code will raise an exception whenever those methods
are not available.
As you wish, changed that.
Now `P.is_induced_subposet('junk')` will say `AttributeError: 'str' object
has no attribute '_is_facade'`. A slightly confusing to a user, but should
not be that hard to track the error.
(Quite many Sage functions give strange errors from wrong input... At
least this won't be first one.)
--
Ticket URL: <http://trac.sagemath.org/ticket/15875#comment:65>
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