Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
HPL_daxpy(3)		     HPL Library Functions		  HPL_daxpy(3)

NAME
       HPL_daxpy - y :=	y + alpha * x.

SYNOPSIS
       #include	"hpl.h"

       void  HPL_daxpy(	 const	int  N,	 const double ALPHA, const double * X,
       const int INCX, double *	Y, const int INCY );

DESCRIPTION
       HPL_daxpy scales	the vector x by	alpha and adds it to y.

ARGUMENTS
       N       (local input)	       const int
	       On entry, N specifies the length	of the vectors	x  and	 y.  N
	       must be at least	zero.

       ALPHA   (local input)	       const double
	       On  entry,  ALPHA specifies the scalar alpha.   When  ALPHA  is
	       supplied	as zero, then the entries of the incremented  array  X
	       need not	be set on input.

       X       (local input)	       const double *
	       On entry,  X  is	an incremented array of	dimension  at  least (
	       1 + ( n - 1 ) * abs( INCX ) )  that  contains the vector	x.

       INCX    (local input)	       const int
	       On entry, INCX specifies	the increment for the elements	of  X.
	       INCX must not be	zero.

       Y       (local input/output)    double *
	       On entry,  Y  is	an incremented array of	dimension  at  least (
	       1 + ( n - 1 ) * abs( INCY ) )  that  contains the vector	y.  On
	       exit, the entries of the	incremented array  Y  are updated with
	       the scaled entries of the incremented array X.

       INCY    (local input)	       const int
	       On entry, INCY specifies	the increment for the elements	of  Y.
	       INCY must not be	zero.

EXAMPLE
       #include	"hpl.h"

       int main(int argc, char *argv[])
       {
	  double x[3], y[3];
	  x[0] = 1.0; x[1] = 2.0; x[2] = 3.0;
	  y[0] = 4.0; y[1] = 5.0; y[2] = 6.0;
	  HPL_daxpy( 3,	2.0, x,	1, y, 1	);
	  printf("y=[%f,%f,%f]\n", y[0], y[1], y[2]);
	  exit(0); return(0);
       }

SEE ALSO
       HPL_dcopy (3), HPL_dscal	(3), HPL_dswap (3).

HPL 2.1			       October 26, 2012			  HPL_daxpy(3)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | EXAMPLE | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=HPL_daxpy&sektion=3&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help