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**

# Detailed Description

# 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 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**.

## 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 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**.

## 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 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**.

## 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 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**.

# Author

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