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- A
- (input/output) REAL or COMPLEX
square array, shape
.
On entry, the matrix
.
If
'U', the upper triangular part of
contains the upper triangular part of matrix
.
If
'L', the lower triangular part of
contains the lower triangular part of matrix
.
On exit,
if
'V', then the columns
of
contain the eigenvectors, normalized as follows:
If JOBZ = 'N', then the upper triangle (if UPLO = 'U') or
the lower triangle (if UPLO = 'L') of
, including the diagonal,
is destroyed.
- B
- (input/output) REAL or COMPLEX square array,
shape
with
.
On entry, the matrix
.
If
'U', the upper triangular part of
contains the upper triangular part of matrix
.
If
'L', the lower triangular part of
contains the lower triangular part of matrix
.
On exit, if the part of
containing the matrix is overwritten by the triangular factor
or
of the Cholesky factorization
or
,
respectively.
- W
- (output) REAL array, shape
with
.
The eigenvalues in ascending order.
- ITYPE
- Optional (input) INTEGER.
Specifies the problem type to be solved:
Default value: 1.
- JOBZ
- Optional (input) CHARACTER(LEN=1).
Default value: 'N'.
- UPLO
- Optional (input) CHARACTER(LEN=1).
Default value: 'U'.
- 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
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Susan Blackford
2001-08-19