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Finding coefficients from factorized polynomial?

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Emanuele Joy
Emanuele Joy 2018-6-7
关闭： Emanuele Joy 2018-6-8
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 ?

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John D'Errico
John D'Errico 2018-6-7
编辑：John D'Errico 2018-6-7
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?
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Emanuele Joy
Emanuele Joy 2018-6-8
@Walter, you're godsent. The update fixed my issue, thank you!

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