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{ Improved |
initial writing: 2006-11-10 |
The dyad { on integer indices has been made faster and leaner. The following benchmarks demonstrate the improvement:
y=: a.{~ (1000,c)?@$ 256
i=: 1e6 ?@$ #y
ts=: 6!:2 , 7!:2@] NB. time and space
ts 'i{y'
| c | J 6.02 | J 6.01 | Ratio | |||||||||
| 1 | 0.00402030 | 1.04922e6 | 0.01261339 | 5.24352e6 | 3.14 | 5.00 | ||||||
| 2 | 0.00424856 | 2.09779e6 | 0.01337689 | 6.29210e6 | 3.15 | 3.00 | ||||||
| 3 | 0.01599239 | 4.19494e6 | 0.02803569 | 8.38925e6 | 1.75 | 2.00 | ||||||
| 4 | 0.00714082 | 4.19494e6 | 0.01643338 | 8.38925e6 | 2.30 | 2.00 | ||||||
| 5 | 0.01880818 | 8.38925e6 | 0.03039327 | 1.25836e7 | 1.62 | 1.50 | ||||||
| 6 | 0.01349971 | 8.38925e6 | 0.03606668 | 1.25836e7 | 2.67 | 1.50 | ||||||
| 7 | 0.02171499 | 8.38925e6 | 0.03826382 | 1.25836e7 | 1.76 | 1.50 | ||||||
| 8 | 0.01398362 | 8.38925e6 | 0.02500564 | 1.25836e7 | 1.79 | 1.50 | ||||||
| 9 | 0.02987036 | 1.67779e7 | 0.04087507 | 2.09722e7 | 1.37 | 1.25 | ||||||
| 10 | 0.02536594 | 1.67779e7 | 0.04197008 | 2.09722e7 | 1.65 | 1.25 | ||||||