Reference

This section contains detailed descriptions of all Frequency Domain System Identification Toolbox functions. It begins with a list of functions grouped by subject area and continues with the reference entries in alphabetical order. Information is also available through the online Help facility.

Function Tables

Excitation Signal Design

Function	Purpose
dibs	Discrete interval binary sequence design
dibsimpr	Discrete interval binary sequence improvement
lin2qlog	Quasi-logarithmic frequency set from linear grid
log2qlog	Quasi-logarithmic frequency set from log grid
mlbs	Maximum length binary sequence (PRBS)
msinclip	Crest factor minimization of multisine
msinprep	Time domain multisine for download
optexcit	Excitation signal with optimum power spectrum

Preprocessing of Data

Function	Purpose
modifyfv	Data prefiltering by inverse of known partial "tf"
tim2fou	Time domain to frequency domain conversion
varanal	Variance analysis and averaging of data

Estimation

Function	Purpose
elis	Iterative minimization of the LS cost function
elisqa	Generate run parameter settings for elis
elrpf2v	List run parameter file or convert to run parameter vectors
elrpv2f	List run parameter vectors or convert to run parameter file
gmean	Geometric mean of complex vectors and numbers

Presentation of the Results

Function	Purpose
expvect	Export vectors to ASCII files for plotting
gmean	Geometric mean of complex vectors and numbers
ploteltf	Plot transfer functions and confidence intervals
plotelpz	Plot pole/zero patterns with uncertainty ellipses

Model Validation

Function	Purpose
Function	Purpose
fdcovpzp	Pole-zero model to transfer function conversion
rdueelis	Calculate residuals after identification
simfou	Generate simulated frequency domain data
simtime	Generate simulated time domain data
stdpz	Calculate zero/pole uncertainties
stdtf	Calculate transfer function uncertainties
stdtfm	Calculate uncertainties of Ym/Xm points

Model Conversions

Function	Purpose
elis2tha	ELiS to theta format conversion
tha2elis	Theta format to ELiS conversion

Data Vector and File Read/Write

Function	Purpose
elisfcnv	Conversion between different file formats
expcov	Write data to covariance vector or file
expfou	Write data to Fourier vector or file
exppar	Write data to parameter vector or file
exptim	Write data to time domain data vector or file
expvar	Write data to variance vector or file
expvect	Export vectors to ASCII files for plotting etc.
impcov	Read data from covariance vector or file
impfou	Read data from Fourier vector or file
imppar	Read data from parameter vector or file
imptim	Read data from time domain data vector or file
impvar	Read data from variance vector or file
loadasc	Load contents of ASCII file into variable

Other

Function	Purpose
fdiddemo	Demonstrations for the toolbox
fnamanal	Analysis of filenames
gmean	Geometric mean of complex vectors and numbers
loadvar	Load value of single variable from MAT-file
pairs	Find closest point pairs in two complex vectors
savevar	Save variable into existing MAT-file
yesinput	"Intelligent" input function with default value
ywalk	yulewalk without windowing