statsmodels.tsa.arima_process.index2lpol#
- statsmodels.tsa.arima_process.index2lpol(coeffs, index)[source]#
Expand coefficients to lag poly
- Parameters:
- coeffsarray_like
non-zero coefficients of lag polynomial
- indexarray_like
index (lags) of lag polynomial with non-zero elements
- Returns:
- ar
ndarray coefficients of lag polynomial
- ar