But this doesn't get 1-1, 2-2 or 3-3. I had tried something like that use #reverse on each combination, but #combinations does not generate -duplicates- from the number sequences.--
On Tue, Jan 5, 2010 at 12:16, Henrik Johansen <henrik.s.johansen@veloxit.no> wrote:
How about:On Jan 5, 2010, at 5:19 32PM, John Toohey wrote:
> Hi,
> I'm trying to generate the permutations of a sequence of numbers. I've found # permutationsDo: aBlock, but this generated the permutation of the entire sequence. I want to do it in groups of 2. The #combinations: anInteger atATimeDo: aBlock method does what I need for combinations, but I cannot find the equivalent for permutations. Does something like this exist in the standard library, or in an external package.
>
> --
> -JT
#(1 2 3 4) combinations: 2 atATimeDo: [:array | array permutationsDo: [:each | Transcript show: each printString; cr]] ?
Cheers,
Henry
_______________________________________________
Pharo-project mailing list
Pharo-project@lists.gforge.inria.fr
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
-JT
_______________________________________________
Pharo-project mailing list
Pharo-project@lists.gforge.inria.fr
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project