code: def ascolumn(x, dtype = None):
      '''Convert ``x`` into a ``column``-type ``numpy.ndarray``.'''
      x = asarray(x, dtype)
      return x if len(x.shape) >= 2 else x.reshape(len(x),1f ascolumn(x, dtype = None):
      '''Convert ``x`` into a ``column``-type ``numpy.ndarray``.'''
      x = asarray(x, dtype)
      return x if len(x.shape) >= 2 else x.reshape(len(x),1)
docs: Convert ``x`` into a ``column``-type ``numpy.ndarray``.