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Compute the quadratic and log-least-squares cost functions comparing two sets of frequency response functions.
[cst] = ii_cost(xf,xe)
For two sets of FRFs H and Ĥ, the quadratic cost function is given by
|| Ĥij(sk) − Hij(sk) |2|
and the log-least-square cost function by
For sets xf and xe stored using the xf format , ii_cost computes both those costs which are used in identification and model update algorithms (see section 3.2.3).