Just from the hip.
;(<@(##{.);.2~ 1,~2>/\a:e.~])
'';'Hi';'';'';'Ho';'';'hee';'';'';'haw';'';'';'Yo';''
++--+--+--+--+--+---+---+---+---+---+---+--+--+
||Hi|Hi|Hi|Ho|Ho|hee|hee|hee|haw|haw|haw|Yo|Yo|
++--+--+--+--+--+---+---+---+---+---+---+--+--+
R.E. Boss
> -----Original Message-----
> From: [email protected] [mailto:programming-
> [email protected]] On Behalf Of Devon McCormick
> Sent: maandag 5 januari 2015 17:07
> To: J-programming forum
> Subject: [Jprogramming] Forward fill w/o looping
>
> I just threw together a short J solution that does what I want but it uses
> a loop and a conditional. I'm thinking there's got to be some kind of
> loopless prefix sort of solution but am at a loss to come up with it.
>
> My code looks like this:
>
> fillEmptyFwd=: 3 : 0
> for_ix. i.<:#y do.
> if. 0=#>y{~>:ix do. y=. (ix{y) (>:ix)}y end.
> end.
> y
> )
>
> An example usage would be this:
>
> fillEmptyFwd '';'Hi';'';'';'Ho';'';'hee';'';'';'haw';'';'';'Yo';''
> ++--+--+--+--+--+---+---+---+---+---+---+--+--+
> ||Hi|Hi|Hi|Ho|Ho|hee|hee|hee|haw|haw|haw|Yo|Yo|
> ++--+--+--+--+--+---+---+---+---+---+---+--+--+
>
> Any ideas on something less loopy/conditional?
>
> --
> Devon McCormick, CFA
> ----------------------------------------------------------------------
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