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suppose a nonlinear system with 3 input-3 output,in-out data has been logged on a experiment at the same time,if we do/do not a normalization(take data between -1 and 1), on in-out data ,is result the same,after a black-box(Nonlinear arx identification or Nonlinear Grey-Box or arx and Identification,and so on) identification?

M.J Jalali
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    This question seems like it needs a lot more context to be answerable. What sort of system? What sort of normalization? What sort of "in-out data"? What do you mean by "black-box identification"? – Gareth McCaughan Nov 04 '16 at 17:23

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i tried that,take data between -1 and 1,then do a "nlarx" identification,the result was not the same.

M.J Jalali
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