Let’s say, I use Symbolics.jl to define a polynomial in λ with symbolic coefficients.
using Symbolics
@variables λ p q
f = λ^3 + p*λ + q
How do I get the free term of the polynomial with respect to λ?
I can use Symbolics.coeff(f, λ^3) and Symbolics.coeff(f, λ) to extract the coefficients of the first two terms, but Symbolics.coeff(f, λ^0) just returns 0, although I want to get q.