axpy(3) Library Functions Manual axpy(3)

axpy - axpy: y = ax + y


subroutine caxpy (n, ca, cx, incx, cy, incy)
CAXPY subroutine daxpy (n, da, dx, incx, dy, incy)
DAXPY subroutine saxpy (n, sa, sx, incx, sy, incy)
SAXPY subroutine zaxpy (n, za, zx, incx, zy, incy)
ZAXPY

CAXPY

Purpose:

!>
!>    CAXPY constant times a vector plus a vector.
!> 

Parameters

N
!>          N is INTEGER
!>         number of elements in input vector(s)
!> 

CA

!>          CA is COMPLEX
!>           On entry, CA specifies the scalar alpha.
!> 

CX

!>          CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!> 

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of CX
!> 

CY

!>          CY is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
!> 

INCY

!>          INCY is INTEGER
!>         storage spacing between elements of CY
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!> 

Definition at line 87 of file caxpy.f.

DAXPY

Purpose:

!>
!>    DAXPY constant times a vector plus a vector.
!>    uses unrolled loops for increments equal to one.
!> 

Parameters

N
!>          N is INTEGER
!>         number of elements in input vector(s)
!> 

DA

!>          DA is DOUBLE PRECISION
!>           On entry, DA specifies the scalar alpha.
!> 

DX

!>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!> 

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of DX
!> 

DY

!>          DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
!> 

INCY

!>          INCY is INTEGER
!>         storage spacing between elements of DY
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!> 

Definition at line 88 of file daxpy.f.

SAXPY

Purpose:

!>
!>    SAXPY constant times a vector plus a vector.
!>    uses unrolled loops for increments equal to one.
!> 

Parameters

N
!>          N is INTEGER
!>         number of elements in input vector(s)
!> 

SA

!>          SA is REAL
!>           On entry, SA specifies the scalar alpha.
!> 

SX

!>          SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!> 

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of SX
!> 

SY

!>          SY is REAL array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
!> 

INCY

!>          INCY is INTEGER
!>         storage spacing between elements of SY
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!> 

Definition at line 88 of file saxpy.f.

ZAXPY

Purpose:

!>
!>    ZAXPY constant times a vector plus a vector.
!> 

Parameters

N
!>          N is INTEGER
!>         number of elements in input vector(s)
!> 

ZA

!>          ZA is COMPLEX*16
!>           On entry, ZA specifies the scalar alpha.
!> 

ZX

!>          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!> 

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of ZX
!> 

ZY

!>          ZY is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
!> 

INCY

!>          INCY is INTEGER
!>         storage spacing between elements of ZY
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!> 

Definition at line 87 of file zaxpy.f.

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