Very nice, may be Chris could add it into phrase book.

Zsbán Ambrus wrote:
On Wed, Mar 5, 2008 at 6:05 AM, bill lam <[EMAIL PROTECTED]> wrote:
how to find the leading edge of a boolean array,
 eg. for this array
   0 1 0 1 1 0 1 1 1 0 1 0

 I want the result as
   0 1 0 1 0 0 1 0 0 0 1 0

I recommend this:

   ]a =: 0 1 0 1 1 0 1 1 1 0 1 0
0 1 0 1 1 0 1 1 1 0 1 0
   (>|.!.0) a
0 1 0 1 0 0 1 0 0 0 1 0

Ambrus
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