PLASMA  2.8.0
PLASMA - Parallel Linear Algebra for Scalable Multi-core Architectures
int CORE_dlarfx2 ( PLASMA_enum  side,
int  N,
double  V,
double  TAU,
double *  C1,
int  LDC1,
double *  C2,
int  LDC2 
)

CORE_dlarfx2 applies a complex elementary reflector H to a complex m by n matrix C, from either the left or the right. H is represented in the form

  H = I - tau * v * v'

where tau is a complex scalar and v is a complex vector.

If tau = 0, then H is taken to be the unit matrix

This version uses inline code if H has order < 11.

Parameters
[in]side
  • PlasmaLeft : form H * C
  • PlasmaRight: form C * H
[in]NThe number of columns of C1 and C2 if side = PlasmaLeft. The number of rows of C1 and C2 if side = PlasmaRight.
[in]VThe double complex V in the representation of H.
[in]TAUThe value tau in the representation of H.
[in,out]C1dimension (LDC1,N), if side = PlasmaLeft dimension (LDC1,1), if side = PlasmaRight On entry, the m by n matrix C1. On exit, C1 is overwritten by the matrix H * C1 if SIDE = PlasmaLeft, or C1 * H if SIDE = PlasmaRight.
[in]LDC1The leading dimension of the array C1. LDC1 >= max(1,N), if side == PlasmaRight. LDC1 >= 1, otherwise.
[in,out]C2dimension (LDC2,N), if side = PlasmaLeft dimension (LDC2,1), if side = PlasmaRight On entry, the m by n matrix C2. On exit, C2 is overwritten by the matrix H * C2 if SIDE = PlasmaLeft, or C2 * H if SIDE = PlasmaRight.
[in]LDC2The leading dimension of the array C2. LDC2 >= max(1,N), if side == PlasmaRight. LDC2 >= 1, otherwise.
Returns
Return values
PLASMA_SUCCESSsuccessful exit
<0if -i, the i-th argument had an illegal value