** Next:** Examples
** Up:** Generalized Symmetric Eigenvalue Problems
** Previous:** Purpose
** Contents**
** Index**

- AP
- (
*input/output*) **REAL** or **COMPLEX** array,
shape with
, where
is the order of and .

On entry, the upper or lower triangle of matrix
in packed storage. The elements are stored columnwise as follows:

On exit, the contents of **AP** are destroyed.

- BP
- (
*input/output*) **REAL** or **COMPLEX** array,
shape and
.

On entry, the upper or lower triangle of matrix
in packed storage. The elements are stored columnwise as follows:

On exit, the triangular factor or of the Cholesky
factorization or , in the same storage
format as .

- W
- (
*output*) **REAL** array, shape with
(**W**) .

The eigenvalues in ascending order.

- ITYPE
*Optional* (*input*) **INTEGER**.

Specifies the problem type to be solved:

Default value: 1.

- UPLO
*Optional* (*input*) **CHARACTER(LEN=1)**.

Default value: 'U'.

- Z
*Optional* (*output*) **REAL** or **COMPLEX**
square array, shape with (**Z**,1) .

The matrix of eigenvectors, normalized as follows:

- INFO
*Optional* (*output*) **INTEGER**.

If **INFO** is not present and an error occurs, then the
program is terminated with an error message.

**References**: [1] and [17,9,20].

** Next:** Examples
** Up:** Generalized Symmetric Eigenvalue Problems
** Previous:** Purpose
** Contents**
** Index**
Susan Blackford
2001-08-19