[R] coefficient of polynomial expansion

[Gabor Grothendieck]

On 8/8/05, Peter Yang <peterwyang at gmail.com> wrote:
> Hi,
> 
> I would like to get the coefficient of polynomial expansion. For example,
> 
> (1+ x)^2 = 1 + 2x + x^2, and the coefficients are 1, 2 and 1.
> (1 + x + x^2)^3 = 1 + 3*x + 6*x^2 + 7*x^3 + 6*x^4 + 3*x^5 + x^6, and
> the coefficients are 1, 3, 6, 7, 6, 3, and 1.
> 

Use symbolic differentiation as in:

https://stat.ethz.ch/pipermail/r-help/2004-December/060797.html