File: nehari.man

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.TH nehari 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
nehari - Nehari approximant
.SH CALLING SEQUENCE
.nf
[x]=nehari(R [,tol])
.fi
.SH PARAMETERS
.TP
R
: linear system (\fVsyslin\fR list)
.TP
x
: linear system (\fVsyslin\fR list)
.TP
tol
: optional threshold
.SH DESCRIPTION
.Vb [x]=nehari(R [,tol])
returns the Nehari approximant of \fVR\fR.
.LP
\fVR\fR = linear system in state-space representation (\fVsyslin\fR list).
.LP
\fVR\fR is strictly proper and \fV- R~\fR is stable 
(i.e. \fVR\fR is anti stable).
.nf
    || R - X ||oo = min || R - Y ||oo
                  Y in Hoo
.fi