Scilab Function

tf2ss - transfer to state-space

### Calling Sequence

  `sl=tf2ss(h [,tol])`

### Parameters

- `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`