This example computes the two smallest eigenvalues, and the associated eigenvectors, of the matrix $A$, where Here $A$ is Hermitian and must first be reduced to tridiagonal form $T$ by zhetrd. The program then calls dstebz to compute the requested eigenvalues and zstein to compute the associated eigenvectors of $T$. Finally zunmtr is called to transform the eigenvectors to those of $A$.