Help / Release / J 5.03 / f. Improved

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

---

f. Improved

initial writing: 2003-07-14 last updated: 2004-10-26

f. has been improved so that v f. would exploit the special code that would be exploited by a completely primitive version of v ; the execution of x v f. y (and v f. y) would be as fast and as lean as a completely primitive version of v . For example:

   ts=: 6!:2 , 7!:2@]   NB. time and space

   tally =: #
   rev=: |.
   x=: 100000 $ i. 6
   y=: i. 100000 10

   ts 'Expression'

Expression		J 5.03			J 5.02			Ratio
x #/. y		0.0114327	1.57370e6		0.0114442	1.57370e6
x tally/. y		0.114467	1.32402e7		0.115316	1.32402e7
x tally/.f. y		0.0117163	1.57414e6		0.0763963	6.94848e6		6.52	4.41
|."1 y		0.0383105	4.19520e6		0.0383065	4.19520e6
rev"1 y		0.193694	4.19578e6		0.183509	4.19578e6
rev"1 f. y		0.0380708	4.19558e6		0.0994439	4.19603e6		2.61	1.00

---

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