  find
  Builtin Function



      SSyynnooppssiiss
        Find non-zeros.

      SSyynnttaaxx
        find ( _A )

      DDeessccrriippttiioonn
        Find returns a matrix that contains the indices of the non-zero
        elements of the input matrix _A.

        A common usage for find, is the selection of matrix elements
        that meet certain criteria.

        Example:



          > a = rand(4,4)
           a =
           matrix columns 1 thru 4
              0.647      0.665      0.655      0.299
              0.333     0.0847      0.129      0.265
             0.0369      0.204       0.91        0.7
              0.162      0.167      0.112       0.95
          > x = a[ find( a < .1 ) ]
           x =
           matrix columns 1 thru 2
             0.0369     0.0847

































