R.E. Boss wrote: > If the subsets are differently grouped, more efficient solutions are > possible: > > (i. <@comb"0 ])5 > ++-+---+-----+-------+ > ||0|0 1|0 1 2|0 1 2 3| > ||1|0 2|0 1 3|0 1 2 4| > ||2|0 3|0 1 4|0 1 3 4| > ||3|0 4|0 2 3|0 2 3 4| > ||4|1 2|0 2 4|1 2 3 4| > || |1 3|0 3 4| | > || |1 4|1 2 3| | > || |2 3|1 2 4| | > || |2 4|1 3 4| | > || |3 4|2 3 4| | > ++-+---+-----+-------+ > > ts 'ps2 i.15' > 0.051891392 4280704 > ts'(i. <@comb"0 ])15' > 0.0078416183 1611136 > > ts 'ps2 i.20' > 2.238679 1.5356698e8 > ts'(i. <@comb"0 ])20' > 0.40906997 62709248 To be honest to you all this was the kind of alternative I was asking (wrongly typed as challenging) for.
Thanks @@i=arie ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
