cont_frm transfer to controllable state-space

## Syntax

    sl = cont_frm(NUM, den)

## Arguments

NUM

  polynomial matrix

den

  polynomial

sl

  `syslin` list, `sl=[A,B,C,D]`.

## Description

controllable state-space form of the transfer `NUM/den`.

## Examples

    s=poly(0,'s');NUM=[1+s,s];den=s^2-5*s+1;
    sl=cont_frm(NUM,den);
    slss=ss2tf(sl);       //Compare with NUM/den

## See also

- tf2ss
- canon
- contr