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#^:_1 Improved |
initial writing: 2003-03-19 |
The dyad #^:_1 expand has been made more efficient
in time and space. For example:
b=: ?1e6$2 c=: (+/b)$'abcde' i=: ?(+/b)$1e6 x=: ((+/b),10)$'abc' ts=: 6!:2 , 7!:2@] NB. time and space ts 'expression'
Expression | J 5.02 | J 5.01 | Ratio | |||
b #^:_1 c | 0.0356981 1.04966e6 | 0.1568434 1.10112e7 | 4.39 10.49 | |||
b #^:_1 i | 0.0523209 4.19539e6 | 0.1987772 1.57298e7 | 3.80 3.75 | |||
b #^:_1 x | 0.1566205 1.67783e7 | 0.3405053 3.46042e7 | 2.17 2.06 |