statsmodels.tsa.arima_process.lpol2index¶
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statsmodels.tsa.arima_process.
lpol2index
(ar)[source]¶ remove zeros from lagpolynomial, squeezed representation with index
Parameters: ar : array_like
coefficients of lag polynomial
Returns: coeffs : array
non-zero coefficients of lag polynomial
index : array
index (lags) of lagpolynomial with non-zero elements