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Scilab Help >> Control Systems - CACSD > Linear Analysis > Frequency Domain > svplot

svplot

singular-value sigma-plot

Syntax

[SVM]=svplot(sl,[w])

Arguments

sl

syslin list (continuous, discrete or sampled system)

w

real vector (optional parameter)

Description

computes for the system sl=(A,B,C,D) the singular values of its transfer function matrix:

G(jw) = C(jw*I-A)B^-1+D
or
G(exp(jw)) = C(exp(jw)*I-A)B^-1+D
or
G(exp(jwT)) = C(exp(jw*T)*I-A)B^-1+D

evaluated over the frequency range specified by w. (T is the sampling period, T=sl('dt') for sampled systems).

sl is a syslin list representing the system [A,B,C,D] in state-space form. sl can be continuous or discrete time or sampled system.

The i-th column of the output matrix SVM contains the singular values of G for the i-th frequency value w(i).

SVM = svplot(sl)

is equivalent to

SVM = svplot(sl,logspace(-3,3))  (continuous)
SVM = svplot(sl,logspace(-3,%pi)) (discrete)

Examples

x = logspace(-3,3);
y = svplot(ssrand(2,2,4),x);
clf()
plot2d("ln", x, 20*log(y')/log(10))
xgrid(12)
xtitle("Singular values plot","(Rd/sec)", "Db");
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Last updated:
Tue Feb 14 15:02:45 CET 2017