?axpyc

Compute the conjugate of vector x, scale vector x, and then add the product to another vector. The operation is defined as follows: $\text{[math]}$

alpha is a multiplication coefficient, and x and y are vectors with a length of n.

Interface Definition

C interface:

void cblas_caxpyc(const BLASINT n, const void *alpha, const void *x, const BLASINT incx, void *y, const BLASINT incy);

void cblas_zaxpyc(const BLASINT n, const void *alpha, const void *x, const BLASINT incx, void *y, const BLASINT incy);

Fortran interface:

CALL CAXPYC(N, ALPHA, X, INCX, Y, INCY)

CALL ZAXPYC(N, ALPHA, X, INCX, Y, INCY)

Parameters

Parameter	Type	Description	Input/Output
n	Integer	Number of elements in the x vector	Input
alpha	Single-precision complex number type for caxpyc Double-precision complex number type for zaxpyc	Multiplication coefficient	Input
x	For caxpyc, x is of single-precision complex number type. For zaxpyc, x is of double-precision complex number type.	Vector x. The vector size is at least (1+(n-1)*abs(incx)).	Input
incx	Integer	Increment for the elements of vector x	Input
y	For caxpyc, y is of single-precision complex number type. For zaxpyc, y is of double-precision complex number type.	Vector y. The vector size is at least (1+(n-1)*abs(incy)).	Input/Output
incy	Integer	Increment for the elements of vector y	Input

Dependencies

#include "kblas.h"

Examples

C interface:

    float alpha[2] = {0.25, 0.5}; 
    int n = 2, incx = 1, incy = 1; 
    float x[4] = {1.0, 3.0, 5.0, 7.0}; 
    float y[4] = {2.0, 4.0, 6.0, 8.0}; 
 
    cblas_caxpyc(n, alpha, x, incx, y, incy); 
    /** 
     *    Output Y: 3.75, 3.75, 10.75, 8.75
     */

Fortran interface:

      REAL(4) :: ALPHA(2)
      DATA ALPHA /0.25, 0.5 
      INTEGER :: N=5 
      INTEGER :: INCX=1 
      INTEGER :: INCY=1 
      REAL(4) :: X(4) 
      DATA X /1.0, 3.0, 5.0, 7.0/ 
      REAL(4) :: Y(4) 
      DATA Y /2.0, 4.0, 6.0, 8.0/ 
      CALL CAXPYC(N, ALPHA, X, INCX, Y, INCY) 
 
*     Output Y : 3.75, 3.75, 10.75, 8.75

Parent topic: KML_BLAS-like Extensions