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~. Improved |
initial writing: 2004-01-06 |
The monad ~. is now faster and leaner (as are other members of the i. family of facilities). The following benchmarks demonstrate the improvement.
b =: 1e6 ?@$ 2
b6=: 1e6 6 ?@$ 2
c =: a.{~ 1e6 ?@$ #a.
c2=: a.{~ 1e6 2?@$ #a.
c6=: a.{~ 1e6 6?@$ #a.
u =: u: 1e6 ?@$ 65536
i5=: 1e6 ?@$ 1e5
i6=: 1e6 ?@$ 1e6
i9=: 1e6 ?@$ 1e9
d =: 0.01*1e6 ?@$ 1e6
bx=: ":&.>?1e6$2e5
ts=: 6!:2 , 7!:2@] NB. time and space
ts 'Expression'
| Expression | J 5.03 | J 5.02 | Ratio | ||||||
| ~.b | Boolean list | 0.030883 7.680000e2 | 0.104236 9.437888e6 | 3.38 | 12288.92 | ||||
| ~.b6 | Boolean table | 0.258281 1.677792e7 | 0.367496 1.258362e7 | 1.42 | 0.75 | ||||
| ~.c | literal list | 0.031164 1.664000e3 | 0.102883 9.438336e6 | 3.30 | 5672.08 | ||||
| ~.c2 | literal table | 0.037219 3.938560e5 | 0.185982 9.699968e6 | 5.00 | 24.63 | ||||
| ~.c6 | literal table | 0.606159 1.677792e7 | 0.737786 1.782643e7 | 1.22 | 1.06 | ||||
| ~.u | Unicode | 0.037584 3.938560e5 | 0.164569 9.699968e6 | 4.38 | 24.63 | ||||
| ~.i5 | integer list | 0.084340 6.560000e5 | 0.286684 1.258355e7 | 3.40 | 19.18 | ||||
| ~.i6 | integer list | 0.178966 5.243520e6 | 0.404330 1.363213e7 | 2.26 | 2.60 | ||||
| ~.i9 | integer list | 0.480677 1.258355e7 | 0.564432 1.363213e7 | 1.17 | 1.08 | ||||
| ~.d | float list | 1.351204 1.677786e7 | 1.454014 1.782643e7 | 1.08 | 1.06 | ||||
| ~.bx | boxed list | 3.737520 1.258355e7 | 3.688013 1.258355e7 | 0.99 | 1.00 | ||||