Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

cblas_?axpy

Computes a vector-scalar product and adds the result to a vector.

Syntax

void
cblas_saxpy
(
const
MKL_INT
n
,
const
float
a
,
const
float
*x
,
const
MKL_INT
incx
,
float
*y
,
const
MKL_INT
incy
);
void
cblas_daxpy
(
const
MKL_INT
n
,
const
double
a
,
const
double
*x
,
const
MKL_INT
incx
,
double
*y
,
const
MKL_INT
incy
);
void
cblas_caxpy
(
const
MKL_INT
n
,
const
void
*a
,
const
void
*x
,
const
MKL_INT
incx
,
void
*y
,
const
MKL_INT
incy
);
void
cblas_zaxpy
(
const
MKL_INT
n
,
const
void
*a
,
const
void
*x
,
const
MKL_INT
incx
,
void
*y
,
const
MKL_INT
incy
);
Include Files
  • mkl.h
Description
The
?axpy
 routines perform a vector-vector operation defined as 
y := a*x + y
where:
a
 is a scalar
x
 and
y
 are vectors each with a number of elements that equals
n
.
Input Parameters
n
Specifies the number of elements in vectors
x
 and
y
.
a
Specifies the scalar
a
.
x
Array, size at least
(1 + (
n
-1)*abs(
incx
))
.
incx
Specifies the increment for the elements of
x
.
y
Array, size at least
(1 + (
n
-1)*abs(
incy
))
.
incy
Specifies the increment for the elements of
y
.
Output Parameters
y
Contains the updated vector
y
.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.