File: bstap.man

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.TH bstap 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
bstap - hankel approximant
.SH CALLING SEQUENCE
.nf
[Q]=bstap(Sl)
.fi
.SH PARAMETERS
.TP 10
sl
: linear system (\fVsyslin\fR list) assumed continuous-time and anti-stable.
.TP
Q
: best stable approximation of \fVSl\fR (\fVsyslin\fR list).
.SH DESCRIPTION
Computes the best approximant \fVQ\fR of the linear system \fVSl\fR
.IG
.nf
      ||Sl-Q||    =  ||T||
              inf
.fi
.FI
.LA $$   {\Vert Sl-Q\Vert}_\infty    =  \Vert T \Vert $$
where 
.IG
||T||
.FI $\Vert T \Vert$ 
is the  H-infinity norm of the Hankel operator associated with \fVSl\fR.
.SH SEE ALSO
syslin