MB_DGEMV – Performs y := alpha*A*x + beta*y or y := alpha*A^T*x + beta*y

MB_DGEMV – Performs y := alphaAx + betay or y := alphaA^Tx + betay

Block SymbolLicensing group: STANDARD

Function Description
The output references yA, yX and yY are always set to the corresponding input references uA, uX and uY. If HLD = on then nothing is computed otherwise the BLAS function DGEMV is called internally:

DGEMV(sTRANS, M, N, alpha, uA, LDA, uX, INCX, beta, uY, INCY);

where parameters of DGEMV are set in the following way:

Integer input trans is mapped to the string sTRANS: ${0, 1} \to "N"$ , ${2} \to "T"$ and ${3} \to "C"$ .
M is number of rows of the matrix referenced by uA.
N is number of columns of the matrix referenced by uA.
LDA is the leading dimension of matrix referenced by uA.
If the input $incx \neq 0$ then INCX is set to incx else INCX is set to $1$ .
If the input $incy \neq 0$ then INCY is set to incy else INCY is set to $1$ .

The error flag E is set to on if:

the reference uA or uX or uY is not defined (i.e. input uA or uX or uY is not connected),
trans is less than 0 or greater than 3
the call of the function DGEMV returns error using the function XERBLA, see the system log.

See BLAS documentation [6] for more details.

Inputs

uA	Input reference to matrix A	Reference
uX	Input reference to vector x	Reference
uY	Input reference to vector y	Reference
trans	Transposition of the input matrix $↓$ 0 $↑$ 3	Long (I32)
incx	Index increment of vector x	Long (I32)
incy	Index increment of vector y	Long (I32)
alpha	Scalar coefficient alpha	Double (F64)
beta	Scalar coefficient beta	Double (F64)
HLD	Hold	Bool

Outputs

yA	Output reference to matrix A	Reference
yX	Output reference to vector x	Reference
yY	Output reference to vector y	Reference
E	Error indicator	Bool

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