Orders of a hammerstein-wiener model

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DC
DC 2017-5-11
编辑: DC 2017-5-11
When declaring an HW model object, we give the orders of the model as
idnlhw(orders)
Where orders is a vector consisting of three scalar values nb (zeros+1), nf (poles),nk (delay). The documentation says that
For a SISO transfer function, Orders is a vector of positive integers.
However, I'm able to introduce no delay in my input by setting nk = 0. Infact, I'm able to estimate the right output on a model trained with nk = 0 rather than one with a +ve delay (nk). Is this simply an error in the documentation or am I missing something when designing the system?

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