Getting out my snmail address lists for my Midwinter party I
needed to replace all occurrences of nulls with empty character
strings for conversion to csv files . While it might be old hat
for the old hands , I kinda like the fns I came up with and
think they are generally useful .

where : { + ( ^ x ) _vs & ,/ x }
where..h : " like  &  for rectangular boolean arrays "

This would seem the natural extension of & .

skatteramend : { ./[ x ; y ; :[; z ] ] }
skatteramend..h : " replaces items in x at addresses y with value z "

where :[; z ] is the construction presented by Steve Apter in
http://www.kx.com/listbox/k/msg03369.html .

Perhaps someone may suggest a pithier yet memorable name .


So , replacing all the _n in my mail list becomes :

skatteramend[ ML ; where ML ~\:\: _n ; "" ] / result returning

or

skatteramend[ `ML ; where ML ~\:\: _n ; "" ] / amend in place .

A more concrete example :

Q : 3 5 # ! 15 ; skatteramend[ Q ; where Q ! 2 ; -1 ]
( 0 -1 2 -1 4
 -1 6 -1 8 -1
 10 -1 12 -1 14 )


--
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--
 Bob Armstrong -- http://CoSy.com -- 212-285-1864
http://CoSy.com/K/CoSy.htm : Rapid Quantitative Modeling
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2002/01/24 6:15:36 AM