Thanks, this helps!
Generally, is there any reason why combinations should not work on sets? I
may have tunnel vision here as they are everywhere in the systems I build.
On Wednesday, March 23, 2016 at 7:54:05 PM UTC-4, puzzler wrote:
>
> The input should be a sequence not a set, so call seq on the input before
> passing it to this function.
>
> Sorry if that was unclear from the docs. (For some inputs, it is more
> forgiving, but when you call combinations with n=1, it calls distinct on
> the set, and clojure.core's implementation of distinct doesn't work on
> sets).
>
> On Wed, Mar 23, 2016 at 3:45 PM, Matthias Grabmair <matthias...@gmail.com
> <javascript:>> wrote:
>
>> I am just using the math combinatorics library and spent some time
>> debugging until I found out that combinations does not accept n=1. Is this
>> intentional?
>>
>>
>>
>> *=> (clojure.math.combinatorics/combinations #{1 2 3 4} 1)*
>>
>>
>>
>> *UnsupportedOperationException nth not supported on this type:
>> PersistentHashSet clojure.lang.RT.nthFrom (RT.java:933)*
>>
>>
>> *expected: ((1)(2)(3)(4))*
>>
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