Help / Release / J 6.02 / u//. Improved
< Help
Jump to navigation
Jump to search
>> << Pri JfC LJ Phr Dic Voc !: Rel NuVoc wd Help Release
u//. Improved |
initial writing: 2007-07-31 |
The dyad x u//. y has been improved where u and y are one of the following combinations:
verb u | y type | ||
= <. >. + +. * *. ~: | Boolean | ||
<. >. + | integer, floating-point | ||
n b. for n= 17 22 23 25 | integer |
There is a generalization of a similar improvement in J 5.03 which was restricted to vector right arguments. The following benchmarks demonstrate the improvement:
x1=: 2e5 ?@$ 1e1 x2=: 2e5 ?@$ 1e2 x3=: 2e5 ?@$ 1e3 x4=: 2e5 ?@$ 1e4 b=: 2e5 5 ?@$ 2 i=: 2e5 5 ?@$ 1000 d=: 0.1 * i ts=: 6!:2 , 7!:2@] NB. time and space ts 'Expression'
Expression | J 6.02 | J 6.01 | Ratio | |||||||||
x1 ~://. b | 0.00277323 | 1536 | 0.02164587 | 4457984 | 7.81 | 2902.33 | ||||||
x2 ~://. b | 0.00276233 | 3520 | 0.02522252 | 4458880 | 9.13 | 1266.73 | ||||||
x3 ~://. b | 0.00285285 | 19648 | 0.02643234 | 4466048 | 9.27 | 227.30 | ||||||
x4 ~://. b | 0.00375916 | 148672 | 0.03122265 | 4523392 | 8.31 | 30.43 | ||||||
x1 + //. i | 0.00431878 | 2560 | 0.02990644 | 7603840 | 6.92 | 2970.25 | ||||||
x2 + //. i | 0.00435932 | 11712 | 0.03602225 | 7605632 | 8.26 | 649.39 | ||||||
x3 + //. i | 0.00529091 | 167104 | 0.03750901 | 7636352 | 7.09 | 45.70 | ||||||
x4 + //. i | 0.01718684 | 1328320 | 0.04396052 | 7865728 | 2.56 | 5.92 | ||||||
x1 + //. d | 0.00455240 | 2304 | 0.03985561 | 11798400 | 8.75 | 5120.83 | ||||||
x2 + //. d | 0.00455401 | 9664 | 0.04259895 | 11801984 | 9.35 | 1221.23 | ||||||
x3 + //. d | 0.00481319 | 134336 | 0.04401794 | 11863424 | 9.15 | 88.31 | ||||||
x4 + //. d | 0.01125234 | 1066176 | 0.05060965 | 12322176 | 4.50 | 11.56 |