Compare
1 2 3 4 (~.@:,) 5 6 3 4 NB. union u
1 2 3 4 5 6
1 2 3 4 ([,e.#]) 5 6 3 4 NB. union?
1 2 3 4 3 4
Mike Day wrote:
> As in
> 1 2 3 4 (~.@:,) 3 4 5 6 NB. union u
> 1 2 3 4 5 6
> ... or
> 1 2 3 4 ([,e.#]) 3 4 5 6
> 1 2 3 4 5 6
>
> 1 2 3 4 ([-.-.) 3 4 5 6 NB. intersection n
> 3 4
> ... or
> 1 2 3 4 (e.#[) 3 4 5 6
> 3 4
>
> ?
>
> APL has primitives for these of course!
>
> Mike
>
> Kip Murray wrote:
>> The following is easy but interesting.
>>
>> A "set" is a numeric vector without repetitions. Provide definitions for
>> the
>> union u and intersection n of two sets:
>>
>> 1 2 3 4 u 3 4 5 6 NB. elements of one or the other
>> 1 2 3 4 5 6
>>
>> 1 2 3 4 n 3 4 5 6 NB. common elements
>> 3 4
>>
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>>
>>
>
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