Octave and multiple Bode plots -

I am reading an architecture myself and am trying to make some board plots as a motivational exercise. I would like to create a plot that has multiple curves for different values ​​of a parameter in the transfer function, for example I am trying to do the constants of a simple RC filter:

  tau = [1,2,3] i = tau g (i) = tf (1, [tau (i), 1] for) beef (g (1), g (2), g (3))   
 but it does not work, I get an error  
 
 Error: octave_base_value :: imag (): Wrong logic 'struct'  < / Blockquote> 
 However, it works fine If there are not many logic for the BOOT command and the last line is simply:  
  bode (g (1))   
 for any advice Where I went wrong, it will be appreciated - what do I want to do is a better way of doing?   
 
 
 I was able to do it with the following sequence: Debian):  
 < Code> Beed (G) (GCF, "Type", "Excise"), "Next Bench", "Ed") Beed (G) (Beed (G) (3))   
 The second command is similar to   but it works when subplaces occur; I got it.