Introduction - If you have any usage issues, please Google them yourself
This function obtains a unitary matrix Q such that: d=diag(Q*diag(lmd)*Q).
In other words, it gives a way to generate a matrix with given eigenvalues and diagonal elements.
By Daniel Perez Palomar (last revision: May 10, 2004).
Feel free to distribute this file as it is (without including any modifications).