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