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f/\. Improved |
initial writing: 2007-12-13 |
The dyad f/\. have been made more efficient for atomic associative f . The following benchmarks demonstrate the improvements.
y=: 1e4 ?@$ 0 b=: 1e4 ?@$ 2 i=: 1e4 ?@$ 2e9 ts=: 6!:2 , 7!:2@] NB. time and space ts 'Expression'
| Expression | J 6.02 | J 6.01 | Ratio | |||||||||
| 1 + /\. y | 0.000267 | 2.64320e5 | 0.820775 | 1.34662e8 | 3073.30 | 509.47 | ||||||
| 9 + /\. y | 0.000273 | 2.64256e5 | 0.744331 | 1.34662e8 | 2723.45 | 509.59 | ||||||
| 1 >./\. y | 0.000905 | 9.19104e5 | 0.889777 | 1.34662e8 | 983.09 | 146.51 | ||||||
| 9 >./\. y | 0.000863 | 9.19040e5 | 0.842805 | 1.34662e8 | 976.79 | 146.52 | ||||||
| 1 ~:/\. b | 0.000354 | 3.49440e4 | 0.447482 | 1.34318e8 | 1263.90 | 3843.80 | ||||||
| 9 ~:/\. b | 0.000352 | 3.48800e4 | 0.428853 | 1.34318e8 | 1220.03 | 3850.85 | ||||||
| 1 (22 b.)/\. i | 0.000208 | 1.32864e5 | 0.567424 | 1.34466e8 | 2721.59 | 1012.05 | ||||||
| 9 (22 b.)/\. i | 0.000201 | 1.32800e5 | 0.543066 | 1.34466e8 | 2704.64 | 1012.54 | ||||||