dgemv

void dgemv(bool transA, int M, int N, double alpha, const double * A, int lda, const double * x, int incx, double beta, double * y, int incy)

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Double-precision general matrix-vector multiply (GEMV).

Identical contract to sgemv but for double buffers; dispatches to cblas_dgemv.

Math

$y_i \leftarrow \alpha \sum_{j=0}^{N-1} A_{ij} x_j + \beta y_i$

References

Accelerate.framework cblas_dgemv.

Parameters

transAbool

If true, multiply against

A^T

instead of

A

M, Nint

A \in \mathbb{R}^{M \times N}

alpha, betadouble

Linear-combination coefficients.

Aconst double*

Row-major matrix buffer.

xconst double*

Input vector buffer.

ydouble*

Output vector buffer; updated in place.

ldaint

Leading dimension of

A

incx, incyint

Element strides of

x

and

y