>>  <<  Usr  Pri  JfC  LJ  Phr  Dic  Rel  Voc  !:  Help  Release

 u//. Improved initial writing: 2007-07-31last updated: 2007-08-01

The dyad x u//. y has been improved where u and y are one of the following combinations:
 verb u y type = <. >. + +. * *. ~: Boolean <. >. + integer, floating-point n b. for n= 17 22 23 25 integer

There is a generalization of a similar improvement in J 5.03 which was restricted to vector right arguments. The following benchmarks demonstrate the improvement:

```x1=: 2e5 ?@\$ 1e1
x2=: 2e5 ?@\$ 1e2
x3=: 2e5 ?@\$ 1e3
x4=: 2e5 ?@\$ 1e4

b=: 2e5 5 ?@\$ 2
i=: 2e5 5 ?@\$ 1000
d=: 0.1 * i

ts=: 6!:2 , 7!:2@]  NB. time and space
ts 'Expression'
```
 Expression J 6.02 J 6.01 Ratio x1 ~://. b 0.00277323 1536 0.02164587 4457984 7.81 2902.33 x2 ~://. b 0.00276233 3520 0.02522252 4458880 9.13 1266.73 x3 ~://. b 0.00285285 19648 0.02643234 4466048 9.27 227.30 x4 ~://. b 0.00375916 148672 0.03122265 4523392 8.31 30.43 x1 + //. i 0.00431878 2560 0.02990644 7603840 6.92 2970.25 x2 + //. i 0.00435932 11712 0.03602225 7605632 8.26 649.39 x3 + //. i 0.00529091 167104 0.03750901 7636352 7.09 45.70 x4 + //. i 0.01718684 1328320 0.04396052 7865728 2.56 5.92 x1 + //. d 0.00455240 2304 0.03985561 11798400 8.75 5120.83 x2 + //. d 0.00455401 9664 0.04259895 11801984 9.35 1221.23 x3 + //. d 0.00481319 134336 0.04401794 11863424 9.15 88.31 x4 + //. d 0.01125234 1066176 0.05060965 12322176 4.50 11.56

>>  <<  Usr  Pri  JfC  LJ  Phr  Dic  Rel  Voc  !:  Help  Release