naginterfaces.library.blas.dgemm

naginterfaces.library.blas.dgemm(transa, transb, alpha, a, b, beta, c=None)[source]

dgemm performs one of the matrix-matrix operations

where , and are real matrices, and and are real scalars; is always .

For full information please refer to the NAG Library document for f06ya

https://www.nag.com/numeric/nl/nagdoc_28.5/flhtml/f06/f06yaf.html

Parameters
transastr, length 1

Specifies whether the operation involves or .

The operation involves .

or

The operation involves .

transbstr, length 1

Specifies whether the operation involves or .

The operation involves .

or

The operation involves .

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 .

cNone or float, array-like, shape , optional

The matrix .

If , need not be set.

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: .

(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.