I am trying to find the transfer function for a simple RL circuit. At my school they don't use version 7, and I was able to find it with this code:(adsbygoogle = window.adsbygoogle || []).push({});

NUM = 20e3;

DEN = [1 20e3];

sys = tf(NUM, DEN)

That found the transfer function for the RL series circuit with a 20K resistor and a Inductor with a value of 500mH. The transfer function was [tex] \frac{20000}{s+20000}[/tex].

When I try this same code with MatLab version 7, it says that tf is not an undefined function. How do I find the Transfer Function with version 7?

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# Transfer Functions in MatLab

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