[Signal] Algebraic representation of thansfer function

Hello.

I'm using Octave 3.0.1.

There's an exponential in the transfer function I need to use. So I can't use tf. I found this code :

s=zpk('s');
h=exp(s);

but it doesn't work with Octave. I also read that zpk should be replaced by zp2sys but zp2sys('s') generates an error.

Thanks.

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