code: def linear_to_ij(self, linear_inds):
          
          return np.c_[linear_inds / self.width, linear_inds % self.width]
docs: Converts linear indices to row and column coordinates.
  
          Parameters
          ----------
          linear_inds : :obj:`numpy.ndarray` of int
              A list of linear coordinates.
  
          Returns
          -------
          :obj:`numpy.ndarray` of int
              A 2D ndarray whose first entry is the list of row indices
              and whose second entry is the list of column indices.