Help / Release / J 7.01 / ,&.>/"r Improved
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,&.>/"r Improved |
initial writing: 2008-04-08 |
The monad ,&.>/"r (also ,&.>/) has been made more efficient. The following benchmarks demonstrate the improvements.
ts=: 6!:2 , 7!:2@] NB. time and space
x=: a {~ (10,n) ?@$ #a=: ;:'The Mississippi delta was shining like a national guitar'
10 ts ',&.>/"1 x' or 10 ts ',&.>/x'
| n | J 7.01 | J 6.02 | Ratio | |||||||||
| ,&.>/"1 x | ||||||||||||
| 5000 | 0.002155 | 362048 | 0.319172 | 396416 | 148.14 | 1.09 | ||||||
| 10000 | 0.004406 | 722496 | 1.177139 | 789632 | 267.17 | 1.09 | ||||||
| 20000 | 0.008259 | 1443392 | 4.477442 | 1576064 | 542.12 | 1.09 | ||||||
| ,&.>/x | ||||||||||||
| 5000 | 0.007273 | 690688 | 0.009716 | 1454144 | 1.34 | 2.11 | ||||||
| 10000 | 0.006064 | 1388928 | 0.025526 | 2906432 | 4.21 | 2.09 | ||||||
| 20000 | 0.010838 | 2775296 | 0.064701 | 5812096 | 5.97 | 2.09 | ||||||