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f/ Improved (b)

initial writing: 2006-05-26 last updated: 2006-05-26

f/y have been made faster on boolean y with an odd number of columns and commutative boolean functions f (= ~: +. *.). The following benchmarks demonstate the improvement:

b=: 97 10007 ?@$ 2
c=: |: b
timer=: 6!:2
timer 'Expression'

Expression		J 6.01	&nbsp	J 5.04	&nbsp	Ratio
+./b		0.00056599		0.00154346		2.73
+./c		0.00066633		0.00166236		2.49
~:/b		0.00045097		0.00152730		3.39
~:/c		0.00060139		0.00164138		2.73

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