- #1
Msilva
- 5
- 0
I need to find a matrix representation for operator [itex]A=x\frac{d}{dx}[/itex] using Legendre polinomials as base.
I would use [tex]a_{mn}=\int^{-1}_{-1}P_m(x)\,x\frac{d}{dx}\,P_n(x)\,dx[/tex], but I have the problem that Legendre polinomials aren't orthonormal [tex]\langle P_{i}|P_{l}\rangle=\delta_{il}\frac{2}{2i+1}[/tex].
I don't know if I must mutiply the integral of the [itex]a_{mn}[/itex] terms by the norm, because I have terms in n and m order.
I would use [tex]a_{mn}=\int^{-1}_{-1}P_m(x)\,x\frac{d}{dx}\,P_n(x)\,dx[/tex], but I have the problem that Legendre polinomials aren't orthonormal [tex]\langle P_{i}|P_{l}\rangle=\delta_{il}\frac{2}{2i+1}[/tex].
I don't know if I must mutiply the integral of the [itex]a_{mn}[/itex] terms by the norm, because I have terms in n and m order.