code: def values(
      cls,
      dataset,
      dim,
      expanded=True,
      flat=True,
      compute=True,
      keep_index=False,
  ):
      data = dataset.data
      dim_idx = dataset.get_dimension_index(dim)
      if data.ndim == 1:
          data = np.atleast_2d(data).T
      values = data[:, dim_idx]
      if not expanded:
          return util.unique_array(values)
      return values
  
imports: import numpy
  from ..None import util
  from ..dimension import dimension_name
  from ..element import Element
  from ..ndmapping import NdMapping, item_check, sorted_context
  from .interface import DataError, Interface
label_desc: Use image node_id 9 for calling the ArrayInterface obj's underlying member method code with example usage: obj.values(cls, dataset, dim, expanded, flat, compute, keep_index) and returns: values, util