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f/@, Improved |
initial writing: 2000-00-00 |
The phrase f/@,
is now supported by special code, for dense as well as sparse arrays.
(Previously, it was supported by special code for sparse arrays only.)
A time-space comparison is as follows:
ts=: 6!:2 , 7!:2@] NB. time-space x=: o. ?11 13 17 61$1000 NB. dense array s=: $. x * 0=?($x)$10 NB. sparse array with density of 0.1
J 4.05
ts '+/@, x' 0.00631756 2688 ts '>./@, x' 0.00842537 2688 ts '+/@, s' 0.000160914 1728 ts '>./@, s' 0.000274057 1728
J 4.04
ts '+/@, x' 0.0133911 2.09888e6 ts '>./@, x' 0.0170284 2.09888e6 ts '+/@, s' 0.000164267 1792 ts '>./@, s' 0.000271543 1792