Sep:

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   Separate a matrix or vector based on the criteria entered in s.
   For example [i,j] = Sep('2*fix(x/2) ~= x',x) will place odd numbers
   in i and evennumbers in j

   Since version 1.
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   Form:
   [i, j] = Sep( s, x )
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   ------
   Inputs
   ------
   Criteria           s
   x                  matrix to be separated

   -------
   Outputs
   -------
   i                  Indexes of true results
   j                  Indexes of false results

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