tf2ss transfer to state-space

## Syntax

                sl = tf2ss(h)
                sl = tf2ss(h, tol)

## Arguments

h

  rational matrix

tol

  may be the constant rtol or the 2 vector `[rtol atol]`

  rtol

    tolerance used when evaluating observability.

  atol

    absolute tolerance used when evaluating observability.

sl

  linear system (`syslin` list `sl=[A,B,C,D(s)]`)

## Description

transfer to state-space conversion:

`h=C*(s*eye()-A)^-1*B+D(s)`

## Examples

    s=poly(0,'s');
    H=[2/s,(s+1)/(s^2-5)];
    Sys=tf2ss(H)
    clean(ss2tf(Sys))

## See also

- ss2tf
- tf2des
- des2tf