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/: and \: Improved |
initial writing: 2002-04-15 |
The dyad /: when the left and right arguments are the same boolean, literal, integer, or floating point vector, is now more efficient in time and space. Likewise for the dyad /:"1 when the left and right arguments are the same boolean, literal, integer, or floating point array; likewise for the monads /:~ and /:~"1 and /:"1~ ; likewise for \: instead of /: .
ts=: 6!:2 , 7!:2@] time and space
b=: ?1e6$2 boolean
c=: a.{~?1e6$#a. literal
i=: _5e3+?1e6$1e4 integer
j=: _5e5+?1e6$1e6 integer
k=: _5e8+?1e6$1e9 integer
d=: 0.01 * _5e8+?1e6$1e9 floating point
| Expression | J 5.01 | J 4.06 | ratio | |||
| /:~b boolean | 0.00878715 1.04934e6 | 0.141366 9.43795e6 | 16.09 8.99 | |||
| /:~c literal | 0.0190410 1.04934e6 | 0.179816 9.43795e6 | 9.44 8.99 | |||
| /:~i integer | 0.0810399 4.26061e6 | 0.349042 1.25837e7 | 4.31 2.95 | |||
| /:~j integer | 0.282443 8.38938e6 | 0.767728 1.25837e7 | 2.72 1.50 | |||
| /:~k integer | 0.543127 8.91366e6 | 0.905413 1.25837e7 | 1.67 1.41 | |||
| /:~d floating point | 0.936980 1.73023e7 | 1.60221 1.67780e7 | 1.71 0.97 |