Help / Release / J 4.05 / <@}.;.n Improved
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<@}.;.n Improved |
initial writing: 2000-00-00 |
The interpreter now “recognizes” (implements by special code)
the following verbs, improving their performance in time and space:
<@ }.;.1 <@ }.;._1 <@ }.;.2 <@ }.;._2 <@:}.;.1 <@:}.;._1 <@:}.;.2 <@:}.;._2 <& }.;.1 <& }.;._1 <& }.;.2 <& }.;._2 <&:}.;.1 <&:}.;._1 <&:}.;.2 <&:}.;._2 <@ }:;.1 <@ }:;._1 <@ }:;.2 <@ }:;._2 <@:}:;.1 <@:}:;._1 <@:}:;.2 <@:}:;._2 <& }:;.1 <& }:;._1 <& }:;.2 <& }:;._2 <&:}:;.1 <&:}:;._1 <&:}:;.2 <&:}:;._2
Time and space comparisons are as follows:
t=: 2e6$'abc'
i=: 2e4 ?. #t
t=: (13{a.) i}t
t=: (10{a.) (1+i)}t
t=: t,13 10{a.
ts=: 6!:2 , 7!:2@]
(<@}.;._2 t) -: }.&.><;._2 t
1
(<@}:;._2 t) -: }:&.><;._2 t
1
b=: 1=?.(#t)#40
(b <@}.;._1 t) -: }.&.>b <;._1 t
1
(b <@}:;._1 t) -: }:&.>b <;._1 t
1
| Expression | J 4.05 | J 4.04 |
| <@}.;._2 t | 0.0724894 4.30400e6 | 0.288907 1.01631e7 |
| <@}:;._2 t | 0.0721265 4.30400e6 | 0.259156 1.01631e7 |
| }.&.><;._2 t | 0.206663 1.13593e7 | 0.224922 1.14433e7 |
| }:&.><;._2 t | 0.176644 9.99731e6 | 0.183163 1.00598e7 |
| b <@}.;._1 t | 0.13008 6.35789e6 | 0.626048 1.65999e7 |
| b <@}:;._1 t | 0.130454 6.35789e6 | 0.560835 2.34714e7 |
| }.&.>b <;._1 t | 0.432934 1.95901e7 | 0.45713 2.30083e7 |
| }:&.>b <;._1 t | 0.364633 1.61851e7 | 0.369266 1.63429e7 |