.TH svplot 1 "April 1993" "Scilab Group" "Scilab Function"
.so man1/sci.an 
.SH NAME
svplot - singular-value sigma-plot
.SH CALLING SEQUENCE
.nf
[SVM]=svplot(sl,[w])
.fi
.SH PARAMETERS
.TP
sl
: \fVsyslin\fR list
.TP
w
: real vector (optional parameter)
.SH DESCRIPTION
computes for the system \fVsl=(A,B,C,D)\fR
the singular values of its transfer function matrix:
.nf
             G(jw) = C(jw*I-A)B^-1+D
or
             G(exp(jw)) = C(exp(jw)*I-A)B^-1+D
.fi
evaluated over the frequency range specified by \fVw\fR.
.LP
\fVsl\fR is a \fVsyslin\fR list representing the system
\fV[A,B,C,D]\fR in state-space form.
.LP
The \fVi\fR-th column of the output matrix \fVSVM\fR contains the singular
values of \fVG(exp(jw))\fR for the \fVi\fR-th frequency value \fVw(i)\fR.
.nf
SVM = svplot(sl)
.fi
is equivalent to
.nf
SVM = svplot(sl,logspace(-3,3))  (continuous)
.fi
.nf
SVM = svplot(sl,logspace(-3,%pi)) (discrete)
.fi
.SH EXAMPLE
.nf
x=logspace(-3,3);
y=svplot(ssrand(2,2,4));
xbasc();plot2d([x',x'],20*log(y')/log(10));
xtitle("Singular values (db)");
xbasc();gainplot(x,y);
.fi
.SH AUTHOR
F.D