code: def _zpklp2lp(z, p, k, wo=1):
      """Transform a lowpass filter to a different cutoff frequency."""
  
      degree = _relative_degree(z, p)
  
      # Scale all points radially from origin to shift cutoff frequency
      z_lp = [wo * z1 for z1 in z]
      p_lp = [wo * p1 for p1 in p]
  
      # Each shifted pole decreases gain by wo, each shifted zero increases it.
      # Cancel out the net change to keep overall gain the same
      k_lp = k * wo**degree
  
      return z_lp, p_lp, k_lp
  
file_path: catboost/contrib/python/scipy/py2/scipy/signal/tests/mpsig.py
imports: from __future__ import division
label_desc: Use image node_id 4 for calling a global function with example usage: _zpklp2lp(z, p, k, wo) and returns: z_lp,  p_lp,  k_lp