MATLAB: How to get a vector with the coefficients from a transfer function

coefficientstf

I tried to use the coeffs function, but it's not compatible with tfs
I've this tf:
s = tf('s');
f = s^2 + 2.673 s + 49.92;
It seems simple, but which function can I use to get a vector with the coefficients [1 2.673 49.92]?

Best Answer

Hi Lara,
the tf you generate is a structure and it stores the information you need in the NUM cell. To get your coefficient vector access the NUM cell like this:
s = tf('s');
f = s^2 + 2.673*s + 49.92;
A = tf(f).num{:};
Now, vector A is what you need. :)
Related Question