Example program for dpteqr

This example computes all the eigenvalues and eigenvectors of the symmetric positive definite tridiagonal matrix T, where
T = 4.16 3.17 0.00 0.00 3.17 5.25 -0.97 0.00 0.00 -0.97 1.09 0.55 0.00 0.00 0.55 0.62 .