code: def update(self, params, *args, **kwargs):
      params = super().update(params, *args, **kwargs)
  
      # Observation covariance
      self.ssm["obs_cov", 0, 0] = params[0]
  
      # State covariance
      self.ssm[self._state_cov_idx] = params[1:]
  
file_path: statsmodels/examples/python/statespace_local_linear_trend.py
imports: import numpy
  import pandas
  from scipy.stats import norm
  import statsmodels.api
  import matplotlib.pyplot
  import requests
  from io import BytesIO
  from zipfile import ZipFile
label_desc: Use image node_id 6 for calling the LocalLinearTrend obj's underlying member method code with example usage: obj.update(params) without return types