code: def ar2full(ar):
      """make reduced lagpolynomial into a right side lagpoly array"""
      nlags, nvar, nvarex = ar.shape
      return np.r_[np.eye(nvar, nvarex)[None, :, :], -ar]
  
imports: import numpy
  from scipy import signal
  from statsmodels.tsa.tsatools import lagmat
label_desc: Use image node_id 6 for calling a global function with example usage: ar2full(ar) and returns: np