axpy(3) Library Functions Manual axpy(3)

NAME

axpy - axpy: y = ax + y

SYNOPSIS

Functions

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

Function Documentation

subroutine caxpy (integer n, complex ca, complex, dimension(*) cx, integer incx, complex, dimension(*) cy, integer incy)

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

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.

subroutine daxpy (integer n, double precision da, double precision, dimension(*) dx, integer incx, double precision, dimension(*) dy, integer incy)

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

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.

subroutine saxpy (integer n, real sa, real, dimension(*) sx, integer incx, real, dimension(*) sy, integer incy)

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

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.

subroutine zaxpy (integer n, complex*16 za, complex*16, dimension(*) zx, integer incx, complex*16, dimension(*) zy, integer incy)

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

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.

Author

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