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~: Sparse Arguments |
initial writing: 2001-04-05 |
The monad ~: 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) -: ~: d
1
~: s
0 | 1
1 | 1
2 | 1
3 | 1
4 | 1
5 | 1
8 | 1
11 | 1
12 | 1
13 | 1
~: d
1 1 1 1 1 1 0 0 1 0 0 1 1 1 0
p=: ?.100$1e9
q=: (?.100$20){?.20 5$10
s=: q p}1 $. 1e9 5 ; 0 ; 2-2
$s
1000000000 5
t=: ~: s
$t
1000000000
+/t
21
t -: 1 ((s i. 5$0),(~:q/:p)#p/:p)} 1 $. 1e9;0;0
1
(~.s) -: (~:s)#s
1