minreal minimal balanced realization

## Syntax

                slb = minreal(sl)
                slb = minreal(sl, tol)

## Arguments

sl,slb

  `syslin` lists

tol

  real (threshold)

## Description

`[ae,be,ce]=minreal(a,b,c,domain [,tol])` returns the balanced realization of linear system `sl` (`syslin` list).

`sl` is assumed stable.

`tol` threshold used in `equil1`.

## Examples

    A=[-eye(2,2),rand(2,2);zeros(2,2),-2*eye(2,2)];
    B=[rand(2,2);zeros(2,2)];C=rand(2,4);
    sl=syslin('c',A,B,C);
    slb=minreal(sl);
    ss2tf(sl)
    ss2tf(slb)
    ctr_gram(sl)
    clean(ctr_gram(slb))
    clean(obs_gram(slb))

## See also

- minss
- balreal
- arhnk
- equil
- equil1