###warning :: Work in progress
This is a Numerical Renormalization Group(NRG) code for the single site Anderson
impurity model. I have followed Rev. Mod. Phys. 80, 395(2008)
(https://doi.org/10.1103/RevModPhys.80.395) .
It use LAPACKE (http://www.netlib.org/lapack/lapacke.html) for
matrix operations such as diagonalization, multiplication. It also use OPENMP for parallel computing.
Energy flow Renormalization group : This figure should be compared with the Fig.4 of the RMP paper.