Up: Standard Symmetric Eigenvalue Problems
References:  and [17,9,20].
- (input/output) REAL array shape with
(D) , where is the order of .
On entry, the diagonal elements of the matrix .
On exit, the eigenvalues in ascending order.
- (input/output) REAL array, shape with
On entry, the subdiagonal elements of in E
need not be set but is used by the routine.
On exit, the contents of E are destroyed.
- Optional (output) REAL square array,
shape with (Z,1) .
The columns of contain the
orthonormal eigenvectors of in the order of the eigenvalues.
- Optional (output) INTEGER.
If INFO is not present and an error occurs, then the
program is terminated with an error message.