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f/@,
Improved
|
last updated: 2000-05-10
|
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
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