Help / Release / J 5.03 / [: +./ < Improved
< Help
Jump to navigation
Jump to search
>> << Pri JfC LJ Phr Dic Voc !: Rel NuVoc wd Help Release
[: +./ < Improved |
initial writing: 2003-06-20 |
The following dyads are now supported by special code for
Boolean, integer, floating point, literal, or symbol vectors or scalars:
[: +./ comp | +./@:comp | ||
[: *./ comp | *./@:comp | ||
[: I. comp | I.@:comp |
where comp is one of = ~: < <: >: > E.
(< <: >: > not available for literal).
These are similar to the
special code for comp i. 1: etc. for J5.02.
Time and space savings depend on the arguments used.
For example:
ts=: 6!:2 , 7!:2@] NB. time and space x=: ?1e6$1e9 y=: 1.5e9 ts '+./x>y' 0.0322982 1.04973e6 ts 'x ([: +./ >) y' NB. scan entire x 0.0181442 1408 ts '*./x>y' 0.0246665 1.04973e6 ts 'x ([: *./ >) y' NB. immediate hit 2.23492e_5 1408