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,\ Improved |
initial writing: 2002-01-09 |
The dyad ,\ is now implemented by special code,
resulting in time/space savings.
For example:
] x=: 7 3$'abcdefghijklmnopqrstu'
abc
def
ghi
jkl
mno
pqr
stu
4 <\ x
+---+---+---+---+
|abc|def|ghi|jkl|
|def|ghi|jkl|mno|
|ghi|jkl|mno|pqr|
|jkl|mno|pqr|stu|
+---+---+---+---+
4 ,\ x
abcdefghijkl
defghijklmno
ghijklmnopqr
jklmnopqrstu
ts=: 6!:2 , 7!:2@]
ts 'm ,\x' [ x=: a.{~?(n,2 5)$#a.
| m | n | J 5.01 | J 4.06 | Ratio | ||||
| 11 | 1e4 | 0.0060206 2.09798e6 | 0.0312325 2.36122e6 | 5.19 1.13 | ||||
| 11 | 2e4 | 0.0124971 4.19514e6 | 0.0640936 4.72051e6 | 5.13 1.13 | ||||
| 11 | 4e4 | 0.0241411 8.38944e6 | 0.1231724 9.43910e6 | 5.10 1.13 | ||||
| 11 | 8e4 | 0.0484810 1.67780e7 | 0.2504760 1.88763e7 | 5.17 1.13 | ||||
| _11 | 1e5 | 0.0084807 1.04941e6 | 0.0768173 5.70387e6 | 9.06 5.44 | ||||
| _11 | 2e5 | 0.0177570 2.09798e6 | 0.1439705 1.14145e7 | 8.11 5.44 | ||||
| _11 | 4e5 | 0.0375444 4.19514e6 | 0.2959686 2.28273e7 | 7.88 5.44 | ||||
| _11 | 8e5 | 0.0752040 8.38944e6 | 0.6209876 4.56533e7 | 8.26 5.44 |