Finding coefficients from factorized polynomial?

I have a simple factorized polynomial z = (x+y)^n and I'm trying to find the coefficients for any "n", so I wrote the following code:

 n = input('n: ');

 syms x y
 z = (x+y)^n;

 c = coeffs(z)

My idea is that I'm trying to find the coefficients for when z is some power (say, n = 3; (x+y)^3), but when I run the script it runs forever and I can't pause/stop it, which then I keep having to force-close MATLAB. I reckon the script isn't running because z is factorized, so is there a way for the coeffs function to work for polynomials in the form (x+y)^n ?

Answer 1

[John D'Errico]

I have no idea what you are talking about.

n = 3;
syms x y
z = (x+y)^n;
c = coeffs(z)
c =
[ 1, 3, 3, 1]

It works fine for me. My guess is you have chosen some very large power for n?

What release of MATLAB are you doing this under?

[Emanuele Joy]

Huh, that's odd. I've repeatedly closed and restarted MATLAB and it never computed coeffs, until my laptop eventually crashed. Sounds like it's a hardware issue on my end. Thanks for the help man

[Emanuele Joy]

I'm using R2018a. I just tried your exact code and the same thing is happening, my script runs forever and I can't cancel/pause it. Weird :/

[Walter Roberson]

Do you have Windows 10? If so see https://www.mathworks.com/matlabcentral/answers/399991-syms-sym-and-mupad-functions-cause-matlab-to-freeze

[Emanuele Joy]

@Walter, you're godsent. The update fixed my issue, thank you!