On Nov 9, 2007 3:28 PM, Dan Bron <[EMAIL PROTECTED]> wrote:
> If we had a "Fibonacci inverse",

Borrowing from http://www.jsoftware.com/jwiki/Essays/Fibonacci_Sequence
and adding inv:

   ifib=: [: <. 13 :'0.5 + (%:5) %~ (2 %~ 1+%:5)^y' inv
   ifib 1 2 3 5 8 13 21 34 55 89
0 2 3 4 5 6 7 8 9 10

-- 
Raul
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