How to get all the coefficients of a polynomial with symbolic coefficients?

I tried this

 syms f1 f2 z
a = (f1-f2)*z^2 + f1*z +1
coeffes(a,z,'all')

I expected to get [f1-f2, f1, 1]But it reports error. Does anyone know any other methods to do this?

Answer 1

[Star Strider]

The method you are using is correct. Your spelling of the coeffs function is not.

Try this:

syms f1 f2 z
a = (f1-f2)*z^2 + f1*z + 1;
[cfs,trms] = coeffs(a,z,'all')

cfs =
[ f1 - f2, f1, 1]

trms =
[ z^2, z, 1]

Answer 2

[John D'Errico]

If you type the name of the function properly, it will work.

syms f1 f2 z
a = (f1-f2)*z^2 + f1*z +1;
coeffs(a,z,'all')

ans =
[ f1 - f2, f1, 1]

Based on this and the last question I answered from you, I would suggest learning to be more careful in your typing.