Response to a pluse generator type input...

[Jason Rupert]

By any chance is there a function to use to produce a response to a pulse 
generator type input? 

I have a transfer function and I've successfully used the step(...) to look at 
the response of the transfer function to the step input, but I would like to 
have a pulse generator type input and look at the response of the transfer 
function to that. 

Thanks for any information and feedback.