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-. Improved |
initial writing: 2004-01-15 |
The dyad -. is now faster and leaner (as are other members of the i. family of facilities). The following benchmarks demonstrate the improvement.
xb6=: 1e6 6 ?@$ 2 [ yb6=: 5e5 6 ?@$ 2
xc2=: a.{~ 1e6 2?@$ #a. [ yc2=: a.{~ 5e5 2?@$ #a.
xc6=: a.{~ 1e6 6?@$ #a. [ yc6=: a.{~ 5e5 6?@$ #a.
xu=: u: 1e6 ?@$ 65536 [ yu =: u: 5e5 ?@$ 65536
xi5=: 1e6 ?@$ 1e5 [ yi5=: 5e5 ?@$ 1e5
xi6=: 1e6 ?@$ 1e6 [ yi6=: 5e5 ?@$ 1e6
xi9=: 1e6 ?@$ 1e9 [ yi9=: 5e5 ?@$ 1e9
xd =: 0.01*1e6 ?@$ 1e6 [ yd =: 0.01*5e5 ?@$ 1e6
xbx=: ":&.>?1e6$2e5 [ ybx=: ":&.>?5e5$2e5
ts=: 6!:2 , 7!:2@] NB. time and space
ts 'Expression'
| Expression | J 5.03 | J 5.02 | Ratio | |||
| xb6-.yb6 Boolean table | 0.3521663 1.258368e7 | 0.4023112 8.389440e6 | 1.14 0.67 | |||
| xc2-.yc2 literal table | 0.0418805 2.228928e6 | 0.1075153 6.294272e6 | 2.57 2.82 | |||
| xc6-.yc6 literal table | 1.0476035 1.258368e7 | 1.1020239 1.468083e7 | 1.05 1.17 | |||
| xu -.yu Unicode list | 0.0427420 2.228928e6 | 0.1119265 6.294272e6 | 2.62 2.82 | |||
| xi5-.yi5 integer list | 0.0818177 4.326080e6 | 0.1701286 8.389376e6 | 2.08 1.94 | |||
| xi6-.yi6 integer list | 0.1937827 5.243584e6 | 0.2932518 1.048653e7 | 1.51 2.00 | |||
| xi9-.yi9 integer list | 0.5822542 8.389312e6 | 0.7092077 1.048653e7 | 1.22 1.25 | |||
| xd -.yd real list | 1.1664952 1.258362e7 | 1.2117685 1.468083e7 | 1.04 1.17 | |||
| xbx-.ybx boxed list | 3.3086535 8.389312e6 | 3.4768167 8.389376e6 | 1.05 1.00 |