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 ~: Improved initial writing: 2004-01-14last updated: 2004-10-26

The monad ~: is now faster and leaner (as are other members of the i. family of facilities). The following benchmarks demonstrate the improvement.

```b =: 1e6   ?@\$ 2
b6=: 1e6 6 ?@\$ 2
c =: a.{~ 1e6  ?@\$ #a.
c2=: a.{~ 1e6 2?@\$ #a.
c6=: a.{~ 1e6 6?@\$ #a.
u =: u: 1e6 ?@\$ 65536
i5=: 1e6 ?@\$ 1e5
i6=: 1e6 ?@\$ 1e6
i9=: 1e6 ?@\$ 1e9
d =: 0.01*1e6 ?@\$ 1e6
bx=: ":&.>?1e6\$2e5

ts=: 6!:2 , 7!:2@]   NB. time and space
ts 'Expression'
```
 Expression J 5.03 J 5.02 Ratio ~:b Boolean list 0.035387   1.049280e6 0.092731   9.437824e6 2.62 8.99 ~:b6 Boolean table 0.264049   9.437888e6 0.335497   1.258362e7 1.27 1.33 ~:c literal list 0.036098   1.049728e6 0.103507   9.437824e6 2.87 8.99 ~:c2 literal table 0.042572   1.180288e6 0.150637   9.437824e6 3.54 8.00 ~:c6 literal table 0.564360   9.437888e6 0.632055   1.258362e7 1.12 1.33 ~:u Unicode 0.041507   1.180288e6 0.155156   9.437824e6 3.74 8.00 ~:i5 integer list 0.089201   1.180288e6 0.240626   1.258355e7 2.70 10.66 ~:i6 integer list 0.182615   2.097792e6 0.361594   1.258355e7 1.98 6.00 ~:i9 integer list 0.463619   9.437824e6 0.534460   1.258355e7 1.15 1.33 ~:d float list 1.315163   9.437824e6 1.407689   1.258355e7 1.07 1.33 ~:bx boxed list 3.610330   9.437824e6 3.675093   1.258355e7 1.02 1.33

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