COMPUTE LOCATION

        [SIC\]COMPUTE OutVar LOCATION InVar Value

    Search  for  Value  in the array InVar, and puts in OutVar the 2 nearest
    indices of InVar for which its values surrounds Value.  These  variables
    have some requirements:
      - InVar  must be a 1D-array of REAL or DOUBLE values,
      - Value  must be scalar numeric,
      - OutVar must be a 1D-array of 2 INTEGER values.
    InVar  is also intended to be ordered (ascending or descending), or else
    the result is unpredictable. Use SIC\SORT to sort arrays.