naginterfaces.library.blas.dsyr2k¶
- naginterfaces.library.blas.dsyr2k(uplo, trans, k, alpha, a, b, beta, c)[source]¶
dsyr2k
performs one of the symmetric rank- update operationswhere and are real matrices, is an real symmetric matrix, and and are real scalars.
For full information please refer to the NAG Library document for f06yr
https://support.nag.com/numeric/nl/nagdoc_30.2/flhtml/f06/f06yrf.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.
- transstr, length 1
Specifies the operation to be performed.
.
or
.
- kint
, the number of columns of and if , or the number of rows of and if or .
- alphafloat
The scalar .
- afloat, array-like, shape
Note: the required extent for this argument in dimension 1 is determined as follows: if : ; if : ; otherwise: .
Note: the required extent for this argument in dimension 2 is determined as follows: if : ; if : ; otherwise: .
The matrix ; is if , or if or .
- bfloat, array-like, shape
Note: the required extent for this argument in dimension 1 is determined as follows: if : ; if : ; otherwise: .
Note: the required extent for this argument in dimension 2 is determined as follows: if : ; if : ; otherwise: .
The matrix ; is if , or if or .
- betafloat
The scalar .
- cfloat, array-like, shape
The symmetric matrix .
- Returns
- cfloat, ndarray, shape
The updated matrix .
- Raises
- NagValueError
- (errno )
On entry, error in parameter .
Constraint: or .
- (errno )
On entry, error in parameter .
Constraint: , or .
- (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.