code: def _lowess_mycube(t):
      """
      Fast matrix cube
  
      Parameters
      ----------
      t : ndarray
          Array that is cubed, elementwise and in-place
  
      Returns
      -------
      Nothing
      """
      # t **= 3
      t2 = t * t
      t *= t2
  
file_path: statsmodels/statsmodels/nonparametric/smoothers_lowess_old.py
imports: import numpy
  from numpy.linalg import lstsq
label_desc: Use image node_id 7 for calling a global function with example usage: _lowess_mycube(t) without return types