RE: bode not working: sys undefined

[Uwe Dippel]

> Here is an example:
>
>
> n=6
> d=[1 2 6]
> sys=tf(n,d);
> sysout(sys)
> bode(sys)

The same goes on ...:
octave:1> n=6
n =  6
octave:2> d=[1 2 6]
d =

  1   2   6

octave:3> sys=tf(n,d);
error: `tf' undefined near line 3 column 5

(I would really like to understand what is going wrong here, seemingly 
all the time!)

Uwe