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

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DmArcher
DmArcher 2017-4-28
编辑： John D'Errico 2017-4-28
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?

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Star Strider
Star Strider 2017-4-28
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]

更多回答（1 个）

John D'Errico
John D'Errico 2017-4-28
编辑：John D'Errico 2017-4-28
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.

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