Hi there,
[...]
> SetPartitions('aabcd', [3,2]).cardinality()
> ///
> Traceback (most recent call last):
[...]
> SetPartitions('aabcd').list()
> ///
> Traceback (most recent call last):
[...]
Thanks Harald for reporting that. I took care of tracking down the bug. It can
be "solved" by just removing a "Set" !!! However, I have a design question:
I don't know how to return a sensible results:
According to the doc:
sage: s = SetPartitions('aa')
Models the set-partition of a *two* element set {a1, a2} where the two a are
different. So that,
sage: s.cardinality()
2
And
sage: s.list()
Should return
[{{'a1', 'a2'}}, {{'a1'}, {'a2'}}]
However since the two 'a' are by no means different, I've no way to prevent
sage to simplify {{'a', 'a'}} in {{'a'}} and {{'a'}, {'a'}} in {{'a'}}
I see two solutions:
1) change the interface and forbid the input of string with repeated letters
2) add an option to returns the partitions as list of list. The user must
turn this option on if he wants a sensible result in the case of repeated
letters.
So my question is: are there any use case for option 2 ?
Any other suggestions ?
Cheers,
Florent
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