Visible to Intel only — GUID: GUID-AF9312C7-B3FD-42A3-A501-C7C3C1B0ACC0
Visible to Intel only — GUID: GUID-AF9312C7-B3FD-42A3-A501-C7C3C1B0ACC0
?axpby
Scales two vectors, adds them to one another and stores result in the vector.
Syntax
call saxpby(n, a, x, incx, b, y, incy)
call daxpby(n, a, x, incx, b, y, incy)
call caxpby(n, a, x, incx, b, y, incy)
call zaxpby(n, a, x, incx, b, y, incy)
call axpby(x, y [,a] [,b])
Include Files
- mkl.fi, blas.f90
Description
The ?axpby routines perform a vector-vector operation defined as
y := a*x + b*y
where:
a and b are scalars
x and y are vectors each with n elements.
Input Parameters
- n
-
INTEGER. Specifies the number of elements in vectors x and y.
- a
-
REAL for saxpby
DOUBLE PRECISION for daxpby
COMPLEX for caxpby
DOUBLE COMPLEX for zaxpby
Specifies the scalar a.
- x
-
REAL for saxpby
DOUBLE PRECISION for daxpby
COMPLEX for caxpby
DOUBLE COMPLEX for zaxpby
Array, size at least (1 + (n-1)*abs(incx)).
- incx
-
INTEGER. Specifies the increment for the elements of x.
- b
-
REAL for saxpby
DOUBLE PRECISION for daxpby
COMPLEX for caxpby
DOUBLE COMPLEX for zaxpby
Specifies the scalar b.
- y
-
REAL for saxpby
DOUBLE PRECISION for daxpby
COMPLEX for caxpby
DOUBLE COMPLEX for zaxpby
Array, size at least (1 + (n-1)*abs(incy)).
- incy
-
INTEGER. Specifies the increment for the elements of y.
Output Parameters
- y
-
Contains the updated vector y.
Example
For examples of routine usage, see these code examples in the Intel® oneAPI Math Kernel Library (oneMKL) installation directory:
saxpby: examples\blas\source\saxpbyx.f
daxpby: examples\blas\source\daxpbyx.f
caxpby: examples\blas\source\caxpbyx.f
zaxpby: examples\blas\source\zaxpbyx.f
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions.
Specific details for the routine axpby interface are the following:
- x
-
Holds the array of size n.
- y
-
Holds the array of size n.
- a
-
The default value is 1.
- b
-
The default value is 1.