Contents     Functions         Previous Next     PDF Index

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 Ĥ, the quadratic cost function is given by

 Jij(Ω) = 
 
ij measured,k∈Ω
 | Ĥij(sk) − Hij(sk) |2

and the log-least-square cost function by

 Jij(Ω) = 
 
ij measured,k∈Ω
 | log 


Ĥij(sk)
Hij(sk)



|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 3.2.3).

See also

id_rc, up_ixf


©1991-2017 by SDTools
Previous Up Next