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~: Improved |
initial writing: 2004-01-14 |
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 | 0.035387 1.049280e6 | 0.092731 9.437824e6 | 2.62 | 8.99 | ||||
| ~:b6 | Boolean table | 0.264049 9.437888e6 | 0.335497 1.258362e7 | 1.27 | 1.33 | ||||
| ~:c | literal list | 0.036098 1.049728e6 | 0.103507 9.437824e6 | 2.87 | 8.99 | ||||
| ~:c2 | literal table | 0.042572 1.180288e6 | 0.150637 9.437824e6 | 3.54 | 8.00 | ||||
| ~:c6 | literal table | 0.564360 9.437888e6 | 0.632055 1.258362e7 | 1.12 | 1.33 | ||||
| ~:u | Unicode | 0.041507 1.180288e6 | 0.155156 9.437824e6 | 3.74 | 8.00 | ||||
| ~:i5 | integer list | 0.089201 1.180288e6 | 0.240626 1.258355e7 | 2.70 | 10.66 | ||||
| ~:i6 | integer list | 0.182615 2.097792e6 | 0.361594 1.258355e7 | 1.98 | 6.00 | ||||
| ~:i9 | integer list | 0.463619 9.437824e6 | 0.534460 1.258355e7 | 1.15 | 1.33 | ||||
| ~:d | float list | 1.315163 9.437824e6 | 1.407689 1.258355e7 | 1.07 | 1.33 | ||||
| ~:bx | boxed list | 3.610330 9.437824e6 | 3.675093 1.258355e7 | 1.02 | 1.33 | ||||