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#^:_1 Improved

initial writing: 2003-03-19 last updated: 2004-10-26

The dyad #^:_1 expand has been made more efficient in time and space. For example:

   b=: ?1e6$2
   c=: (+/b)$'abcde'
   i=: ?(+/b)$1e6
   x=: ((+/b),10)$'abc'

   ts=: 6!:2 , 7!:2@]  NB. time and space
   ts 'expression'

Expression		J 5.02		J 5.01		Ratio
b #^:_1 c		0.0356981   1.04966e6		0.1568434   1.10112e7		4.39   10.49
b #^:_1 i		0.0523209   4.19539e6		0.1987772   1.57298e7		3.80     3.75
b #^:_1 x		0.1566205   1.67783e7		0.3405053   3.46042e7		2.17     2.06

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