Learn more about System Identification Toolbox

fselect - Frequencies from frequency response data

Syntax

idfm = fselect(idf,index)
idfm = fselect(idf,Fmin,Fmax)

Description

idf is any idfrd object. index is a row vector of frequency indices, so that idfm is the idfrd object that contains the response at frequencies idf.Frequency(Index).

If Fmin and Fmax are specified, idfm contains responses at frequencies between Fmin and Fmax.

Note that the operation is the same as dat(index) for an iddata object.

Examples

Select every fifth frequency:

idfm = fselect(idf,5:5:100)

Select the response in the third quadrant:

ph = angle(squeeze(idf.response));
idfm = fselect(idf,find(ph>-pi & ph <-pi/2))

See Also

fcat
iddata
idfrd

fpe

get

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