nehari(1)

NAME
nehari - Nehari approximant

CALLING SEQUENCE
[x]=nehari(R [,tol])

PARAMETERS

R   : linear system (syslin list)

x   : linear system (syslin list)

tol : optional threshold

DESCRIPTION
returns the Nehari approximant of R.

R = linear system in state-space representation (syslin list).

R is strictly proper and - R~ is stable
(i.e. R is anti stable).
    || R - X ||oo = min || R - Y ||oo
                  Y in Hoo