scipy.signal.
lfiltic#
- scipy.signal.lfiltic(b, a, y, x=None)[source]#
- Construct initial conditions for lfilter given input and output vectors. - Given a linear filter (b, a) and initial conditions on the output y and the input x, return the initial conditions on the state vector zi which is used by - lfilterto generate the output given the input.- Parameters:
- barray_like
- Linear filter term. 
- aarray_like
- Linear filter term. 
- yarray_like
- Initial conditions. - If - N = len(a) - 1, then- y = {y[-1], y[-2], ..., y[-N]}.- If y is too short, it is padded with zeros. 
- xarray_like, optional
- Initial conditions. - If - M = len(b) - 1, then- x = {x[-1], x[-2], ..., x[-M]}.- If x is not given, its initial conditions are assumed zero. - If x is too short, it is padded with zeros. 
 
- Returns:
- zindarray
- The state vector - zi = {z_0[-1], z_1[-1], ..., z_K-1[-1]}, where- K = max(M, N).
 
 - See also