ii_cost

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ii_cost

Purpose

Compute the quadratic and log-least-squares cost functions comparing two sets of frequency response functions.

Syntax

[cst] = ii_cost(xf,xe)

Description

For two sets of FRFs H and H^{^}, the quadratic cost function is given by

J_ij(W) =

ij measured,kÎW

(s_k) - H_ij(s_k) |²

and the log-least-square cost function by

J_ij(W) =

ij measured,kÎW

| log

½
½
½
½

(s_k)

H_ij(s_k)

½
½
½
½

|²

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 4.2.3).

See also

id_rc, up_ixf

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