# swap - Man Page

swap: x <=> y

## Synopsis

### Functions

subroutine cswap (n, cx, incx, cy, incy)
CSWAP
subroutine dswap (n, dx, incx, dy, incy)
DSWAP
subroutine sswap (n, sx, incx, sy, incy)
SSWAP
subroutine zswap (n, zx, incx, zy, incy)
ZSWAP

## Function Documentation

### subroutine cswap (integer n, complex, dimension(*) cx, integer incx, complex, dimension(*) cy, integer incy)

CSWAP

Purpose:

`   CSWAP interchanges two vectors.`
Parameters

N

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

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 80 of file cswap.f.

### subroutine dswap (integer n, double precision, dimension(*) dx, integer incx, double precision, dimension(*) dy, integer incy)

DSWAP

Purpose:

```    DSWAP interchanges two vectors.
uses unrolled loops for increments equal to 1.```
Parameters

N

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

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 81 of file dswap.f.

### subroutine sswap (integer n, real, dimension(*) sx, integer incx, real, dimension(*) sy, integer incy)

SSWAP

Purpose:

```    SSWAP interchanges two vectors.
uses unrolled loops for increments equal to 1.```
Parameters

N

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

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 81 of file sswap.f.

### subroutine zswap (integer n, complex*16, dimension(*) zx, integer incx, complex*16, dimension(*) zy, integer incy)

ZSWAP

Purpose:

`    ZSWAP interchanges two vectors.`
Parameters

N

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

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 80 of file zswap.f.

## Author

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## Info

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK