Hey Ric,

I get a chance to repay the favour of helping me out on StackOverflow 
yesterday. 
This solution relies on some boxing, but it does use fill at its core. 

And yes Skip it does end up with a literal result. 
I don't know of a way around that, but I would be happy to be proved wrong as 
well!

    a
0 12 34 678 20
   pad=: > @ (_3&({.!.'0') @ ": each)  
   pad a
000
012
034
678
020

Cheers, bob

> On Feb 18, 2019, at 6:00 PM, Ric Sherlock <[email protected]> wrote:
> 
> ('r<0>0.0' 8!:2 ]) ,. a

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