---
name: "zaxpy.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/zaxpy.f"
---

# zaxpy.f(3)

## NAME

BLAS/SRC/zaxpy.f

## SYNOPSIS

### Functions/Subroutines

subroutine **zaxpy** (n, za, zx, incx, zy, incy)\
 **ZAXPY**

## Function/Subroutine Documentation

### 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

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

Generated automatically by Doxygen for LAPACK from the source code.