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 -. Improved initial writing: 2004-01-15last updated: 2004-10-26

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

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