Help / Release / J 5.04 / ({.,#)/. Improved

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

---

({.,#)/. Improved

initial writing: 2005-01-20 last updated: 2005-01-20

The verb x ({.,#)/. y produces a 2-column table of elements and frequency of occurrences. This verb and the verb x (#,{.)/.y have been made faster and leaner. The following benchmarks demonstrate the improvement.

ts=: 6!:2 , 7!:2@]  NB. time and space
ts '({.,#)/.~ x' 

x		J 5.04				J 5.03				Ratio
1e6 ?@$ 2		0.0003974		1.6000000e3		0.0405565		1.5730432e7		102.05	9831.52
1e6 ?@$ 1e4		0.0089623		1.9782400e5		0.1310025		1.8705344e7		14.62	94.56
1e6 ?@$ 1e5		0.0234292		1.5740800e6		0.3067714		2.6209600e7		13.09	16.65
1e6 ?@$ 1e6		0.1065352		1.2584128e7		0.8107853		7.3483584e7		7.61	5.84
0.01 * 1e6 ?@$ 1e5		0.4857553		1.8875584e7		0.7405234		3.1452736e7		1.52	1.67

---

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