1HPL_daxpy(3)                 HPL Library Functions                HPL_daxpy(3)
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NAME

6       HPL_daxpy - y := y + alpha * x.
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SYNOPSIS

9       #include "hpl.h"
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11       void  HPL_daxpy(  const  int  N,  const double ALPHA, const double * X,
12       const int INCX, double * Y, const int INCY );
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DESCRIPTION

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

18       N       (local input)           const int
19               On entry, N specifies the length of the vectors  x  and   y.  N
20               must be at least zero.
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22       ALPHA   (local input)           const double
23               On  entry,  ALPHA specifies the scalar alpha.   When  ALPHA  is
24               supplied as zero, then the entries of the incremented  array  X
25               need not be set on input.
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27       X       (local input)           const double *
28               On entry,  X  is an incremented array of dimension  at  least (
29               1 + ( n - 1 ) * abs( INCX ) )  that  contains the vector x.
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31       INCX    (local input)           const int
32               On entry, INCX specifies the increment for the elements  of  X.
33               INCX must not be zero.
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35       Y       (local input/output)    double *
36               On entry,  Y  is an incremented array of dimension  at  least (
37               1 + ( n - 1 ) * abs( INCY ) )  that  contains the vector y.  On
38               exit, the entries of the incremented array  Y  are updated with
39               the scaled entries of the incremented array X.
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41       INCY    (local input)           const int
42               On entry, INCY specifies the increment for the elements  of  Y.
43               INCY must not be zero.
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EXAMPLE

46       #include "hpl.h"
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48       int main(int argc, char *argv[])
49       {
50          double x[3], y[3];
51          x[0] = 1.0; x[1] = 2.0; x[2] = 3.0;
52          y[0] = 4.0; y[1] = 5.0; y[2] = 6.0;
53          HPL_daxpy( 3, 2.0, x, 1, y, 1 );
54          printf("y=[%f,%f,%f]\n", y[0], y[1], y[2]);
55          exit(0); return(0);
56       }
57

SEE ALSO

59       HPL_dcopy (3), HPL_dscal (3), HPL_dswap (3).
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63HPL 2.1                        October 26, 2012                   HPL_daxpy(3)
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