The snippet below produces a value for r which I would like to produce more
elegantly: without the for. loop suggested by the repeated building of
r-values. Perhaps a gerund-powered amend could work, but I am not
optimistic enough to travel there without some encouragement.
The result in r is attempting to move the array w to each of the 4 corners
of the array i, in turn.
*******snippet below*******
combis =: #:i. 4
w=: 2 2$'abcd'
i=: 3 3$'MNOPQR'
combis<"1@:{2<\i. 3
┌─────────┬─────────┬─────────┬─────────┐
│┌───┬───┐│┌───┬───┐│┌───┬───┐│┌───┬───┐│
││0 1│0 1│││0 1│1 2│││1 2│0 1│││1 2│1 2││
│└───┴───┘│└───┴───┘│└───┴───┘│└───┴───┘│
└─────────┴─────────┴─────────┴─────────┘
]r=:w (<0 1;0 1)}i
abO
cdR
MNO
r=:r,:w (<0 1;1 2)}i
r=:r, w (<1 2;0 1)}i
;/r=:r,w (<1 2;1 2)}i
┌───┬───┬───┬───┐
│abO│Mab│MNO│MNO│
│cdR│Pcd│abR│Pab│
│MNO│MNO│cdO│Mcd│
└───┴───┴───┴───┘
Thanks,
--
(B=)
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