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Boxed Array References Improved

initial writing: 2005-07-22 last updated: 2006-02-02

Previously, referencing a boxed array x took time proportional to the number of subarrays in x . J 6.01 fixes this performance bug so that referencing a boxed array takes constant time. The following benchmarks demonstrate the improvement:

x=: 1e6 $ <123
y=: 10 $ < 1e5 $ <123
ts=: 6!:2 , 7!:2@]  NB. time and space
ts 'Expression'

Expression		J 6.01				J 5.04				Ratio
#x		2.30611e_6		640		0.0318275		640		13801		1.00
#y		2.22213e_6		640		0.0311371		640		14012		1.00

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