Manual de referencia de MQL5Métodos de matrices y vectoresOpenBLASBLAS Level 2BlasL2SyR2

BlasL2SyR2

Performs a rank-2 update of a symmetric n-by-n matrix.

AU = alpha * x * y**T + alpha * y * x**T + A

BLAS function SYR2.

Computing for type matrix<double>

bool  matrix::BlasL2SyR2(
   double          alpha,         // scalar multiplier alpha
   vector&         X,             // vector X
   vector&         Y,             // vector Y
   matrix&         AU             // updated matrix A
   );

Computing for type matrix<float>

bool  matrixf::BlasL2SyR2(
   float           alpha,         // scalar multiplier alpha
   vectorf&        X,             // vector X
   vectorf&        Y,             // vector Y
   matrixf&        AU             // updated matrix A
   );

Parameters

alpha

[in] Scalar multiplier alpha.

[in] Vector x of size n.

[in] Vector y of size n.

[out] Updated matrix A.

Return Value

Return true if successful, otherwise false in case of an error.

Note

The input can be a symmetric, upper triangular or lower triangular matrix. Triangular matrices are assumed to be symmetric.

BlasL2HeR

BlasL2HeR2