[Jprogramming] convert 0,1 coding to _1,1

[Brian Schott]

   timespacex
6!:2 , 7!:2@]
   am =:_1& (I.@:-.@]})
   am2=: ((-&1) @ +:)
   amd=: <:@:+:
   aml=: _1 + +:
   d=: 2 6 50000?.@$ 2
   timespacex 'am"1 d'
0.011278 1.05535e7
   timespacex 'am2 d'
0.187884 8.39091e6
   timespacex 'amd d'
0.004365 1.6779e7
   timespacex 'aml d'
0.004874 1.67789e7

It looks like David's method is fastest and Peter's is most lean.
And Linda's method loses nothing relative to David's.