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f/ .g Improved |
initial writing: 2009-06-07 |
x f/ .g y is now faster and leaner on boolean x and y , atomic boolean functions g , and f being one of +. *. ~: . The following benchmarks illustrate the improvements. (+./ .*. and ~:/ .*. were previously improved in J5.04 and are only a little faster.)
ts=: 6!:2 , 7!:2@] NB. time and space x=: 1000 1000 ?@$ 2 y=: 1000 1000 ?@$ 2 ts 'x f/ .g y'
| f/ .g | J 7.01 | J 6.02 | Ratio | |||||||||
| ~:/ .*. | 0.147564 | 1.05203e6 | 0.194563 | 1.04992e6 | 1.32 | 1.00 | ||||||
| +./ .*. | 0.148855 | 1.05203e6 | 0.193751 | 1.04992e6 | 1.30 | 1.00 | ||||||
| *./ .+. | 0.148718 | 1.05203e6 | 1.768916 | 3.15360e6 | 11.89 | 3.00 | ||||||
| *./ .= | 0.297020 | 2.09850e6 | 1.689306 | 3.15360e6 | 5.69 | 1.50 | ||||||
| +./ .~: | 0.302557 | 2.09850e6 | 1.655030 | 3.15360e6 | 5.47 | 1.50 | ||||||
| ~:/ .= | 0.298926 | 2.09850e6 | 1.663499 | 3.15360e6 | 5.56 | 1.50 | ||||||
| +./ .> | 0.148963 | 2.10061e6 | 1.672074 | 3.15360e6 | 11.22 | 1.50 | ||||||
| *./ .<: | 0.148627 | 1.05203e6 | 1.677359 | 3.15360e6 | 11.29 | 3.00 | ||||||
| ~:/ .+: | 0.148872 | 2.10061e6 | 1.666052 | 3.15360e6 | 11.19 | 1.50 | ||||||