From the first post in this thread: "The dimension of the matrix can be very large so that generating all cross products then eliminating is not an option."
I hope this helps, -- Raul On Thu, Sep 23, 2021 at 1:58 AM ethiejiesa via Programming <[email protected]> wrote: > > Late to the party, but what about simply thinking of (map) as indexing into > the > cartesian product ({'abc';'ABCD')? > > (({'abc';'ABCD') {~ $ <@#: I.@,) map > ┌──┬──┬──┬──┐ > │aA│aD│bB│bC│ > └──┴──┴──┴──┘ > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
