naginterfaces.library.blas.zhpr2¶
- naginterfaces.library.blas.zhpr2(uplo, alpha, x, y, ap)[source]¶
zhpr2
computes the rank-2 update of a complex Hermitian matrix stored in packed form.For full information please refer to the NAG Library document for f06ss
https://support.nag.com/numeric/nl/nagdoc_30.2/flhtml/f06/f06ssf.html
- Parameters
- uplostr, length 1
Specifies whether the upper or lower triangular part of is stored.
The upper triangular part of is stored.
The lower triangular part of is stored.
- alphacomplex
The scalar .
- xcomplex, array-like, shape
The -element vector .
- ycomplex, array-like, shape
The -element vector .
- apcomplex, array-like, shape
The Hermitian matrix , packed by columns.
- Returns
- apcomplex, ndarray, shape
The updated matrix . The imaginary parts of the diagonal elements are set to zero.
- Raises
- NagValueError
- (errno )
On entry, error in parameter .
Constraint: or .
- (errno )
On entry, error in parameter .
Constraint: .
- (errno )
On entry, error in parameter .
Constraint: .
- (errno )
On entry, error in parameter .
Constraint: .
- Notes
In the NAG Library the traditional C interface for this routine uses a different algorithmic base. Please contact NAG if you have any questions about compatibility.
zhpr2
performs the Hermitian rank-2 update operationwhere is an complex Hermitian matrix, stored in packed form, and are -element complex vectors, and is a complex scalar.