On Fri, Oct 10, 2008 at 4:30 PM, Dan Bron <[EMAIL PROTECTED]> wrote:
> How much better can you do?

Before I try and do better, do you mind if I try figuring out what it
is that I am supposed to do?

Specifically, consider the following (after installing the convert/misc package
through J's package manager):

   require'convert/misc/ascii85'
   f=: toascii85 :.fromascii85
   ascii85b =: a. {~ 33 + (5#85) #: _2&(3!:4)
   ascii85b =: a. {~ 33 + (5#85) #: _2&(3!:4)

   (f -: ascii85) 'food'
0
   (-: f inv @ ascii85) 'food'
1
      f inv @ ascii85b 'food'
doof

-- 
Raul
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