Level of excitation of input signals
Ped = pexcit(Data) [Ped.Maxnr] = pexcit(Data,Maxnr,Threshold)
Data is an iddata object with time- or frequency-domain signals.
Ped is the degree or order of excitation of the inputs in Data. A row vector of integers with as many components as there are inputs in Data. The intuitive interpretation of the degree of excitation in an input is the order of a model that the input is capable of estimating in an unambiguous way.
Maxnr is the maximum order tested. Default is min(N/3,50), where N is the number of input data.
Threshold is the threshold level used to measure which singular values are significant. Default is 1e-9.