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{ Sparse Arguments |
initial writing: 2001-03-01 |
The dyads { now supports sparse left arguments.
(It had long supported sparse right arguments.)
For example:
] d=: ?. 2 3 $ 7 0 5 3 3 1 0 ] s=: $. d 0 1 | 5 0 2 | 3 1 0 | 3 1 1 | 1 ] v=: 7 ?. 7 6 1 2 5 4 3 0 s{v 0 1 | 3 0 2 | 5 1 0 | 5 1 1 | 1 $.^:_1 s{v 6 3 5 5 1 6 d{v 6 3 5 5 1 6 (s{v) -: d{v 1 s{i.7 3 |non-unique sparse elements | s {i.7 3 s{"(1) 0,. 10 20+/i.7 0 1 | 14 0 2 | 12 1 0 | 22 1 1 | 20 d{"(1) 0,. 10 20+/i.7 0 14 12 22 20 0 s{"(1) 10 20+/i.7 |non-unique sparse elements | s {"(1)10 20+/i.7 j=: ?. 1000$2e9 s=: 1 j} 1 $. 2e9 ;0;0 $s 2000000000 $ s { 10 20 2000000000 (s { 10 20) -: 20 j} 1 $. 2e9;0;10 1