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e. Sparse Arguments |
initial writing: 2001-04-05 |
The dyad e. now supports sparse arguments.
For example:
] d=: ?. 15 2$4 0 3 1 2 0 0 2 2 3 1 2 3 0 0 2 2 0 1 0 1 2 2 3 3 2 0 2 1 2 3 s=: $. d (s e. #: i.4) -: d e. #: i.4 1 s e. #: i.4 0 | 0 1 | 0 3 | 0 4 | 0 5 | 0 7 | 0 10 | 0 11 | 0 12 | 0 13 | 0 14 | 0 d e. #: i.4 0 0 1 0 0 0 1 0 1 1 0 0 0 0 0 p=: ?.100$2e9 q=: ?.100$1e9 s=: q p}1 $. 2e9 ; 0 ; 2-2 $s 2000000000 $ s e. q 2000000000 +/ s e. q 100