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i.<./ Improved |
initial writing: 2004-11-02 |
The following monads on integer or floating point lists are now implemented by special code:
| i.<./ | index where the minimum first occurs | |
| i.>./ | index where the maximum first occurs | |
| i:<./ | index where the minimum last occurs | |
| i:>./ | index where the maximum last occurs |
The following benchmarks demonstrate the improvement:
i=: 1e6 ?@$ 2e9 d=: 1e6 ?@$ 0 ts=: 6!:2 , 7!:2@] NB. time and space ts 'Expr'
| Expr | J 5.04 | J 5.03 | Ratio | |||
| (i.<./)i | 0.00244686 1216 | 0.00791307 1280 | 3.23 1.05 | |||
| (i.<./)d | 0.00353955 1216 | 0.02330960 1280 | 6.56 1.05 |