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C. Improved

initial writing: 2005-08-03 last updated: 2006-02-03

The monad C. has been made faster and leaner on permutations. The following benchmarks demonstrate the improvement:

ts=: 6!:2 , 7!:2@]
ts 'C. p'

p		J 6.01				J 5.04				Ratio
i.1e5		0.018944		8.51405e6		0.140333		2.52791e7		7.41		2.97
1|.i.1e5		0.001763		1.18042e6		0.005023		3.27802e6		2.85		2.78
,_2|.\i.1e5		0.009762		4.58496e6		0.069964		1.37540e7		7.17		3.00
?.~1e5		0.003373		1.31328e6		0.006778		3.54438e6		2.01		2.70
i.1e6		0.188565		8.17280e7		1.436150		2.43086e8		7.62		2.97
1|.i.1e6		0.018803		9.43795e6		0.061876		2.62156e7		3.29		2.78
,_2|.\i.1e6		0.098243		4.34857e7		0.725526		1.30456e8		7.39		3.00
?.~1e6		0.129042		1.26066e7		0.164839		3.25539e7		1.28		2.58

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