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+/ .* Improved |
initial writing: 2007-01-24 |
The dyad x +/ .* y has been made more efficient in space on rational or extended integer arguments. (There is little or no change in time.) The following benchmarks demonstrate the improvement:
x=. (s ?@$ 100) %&x: 1+s ?@$ 100 [ s=. 43, n y=. (s ?@$ 100) %&x: 1+s ?@$ 100 [ s=. n,61 ts=: 6!:2 , 7!:2@] NB. time and space ts 'x +/ .* y'
| n | J 6.02 | J 6.01 | Ratio | |||||||||
| 10 | 0.822502 | 5.16224e5 | 0.817593 | 4.22816e6 | 0.99 | 8.19 | ||||||
| 20 | 2.696909 | 8.13696e5 | 2.681346 | 8.19059e6 | 0.99 | 10.07 | ||||||
| 40 | 8.248297 | 1.14067e6 | 8.108024 | 1.59593e7 | 0.98 | 13.99 | ||||||
| 80 | 22.977182 | 1.53427e6 | 23.566001 | 3.10102e7 | 1.03 | 20.21 | ||||||