For some of these polynomials such as Fourier polynomials, it is natural to think about negative subscripts from a pure mathematical perspective. While these ca

For some of these polynomials such as Fourier polynomials, it is natural to think about negative subscripts from a pure mathematical perspective. While these can mapped into non-negative integers, it is often intuitive to use the "negative subscripts" as indexes necessitating methods such as `fftshift`. For many of these polynomials the concept of where they "start" is arbitrary.