Abdelhamied Amr

 same issue

```python class FixedAutoRegressive(ts.signals.AutoRegressive): def sample_next(self, time, samples, errors): ar_value = [self.previous_value[i] * self.ar_param[i] for i in range(len(self.ar_param))] noise = np.random.normal(loc=0.0, scale=self.sigma, size=1) ar_value = np.sum(ar_value) + float(noise) self.previous_value = self.previous_value[1:]...