File Applications/SpinW/m_files/sw_pointsym.m

  determines point group symmetry of a space group at a given position
 
  pOp = SW_POINTSYM(sym, r)
 
  It determines point group symmetry in an arbitrary position in the unit
  cell in any space group. Returns all the generators of the point group.
 
  Input:
 
  sym           Line index in the symmetry.dat file or string of the
                symmetry operators or a cell containing the output of
                sw_gencoord().
  r             Position in the unit cell, dimensions are [3 1].
 
  Output:
 
  pOp           Point group operators, dimensions are [3 3 npOp], these
                operators act on the relative atomic positions (they are in
                the lattice coordinate system). To convert them to
                Cartesian coordinate system, use:
                    R = A*pOp(:,:,ii)*inv(A)
                Where A is a 3x3 matrix, containing the basis vectors of
                the lattice as column vectors.
 
  See also SW_GENATPOS, SW_GENCOORD, SW_GENSYM, SW_BASISMAT.