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
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
