# scal - Man Page

scal: x = alpha x

## Synopsis

### Functions

subroutine cscal (n, ca, cx, incx)
CSCAL
subroutine csscal (n, sa, cx, incx)
CSSCAL
subroutine dscal (n, da, dx, incx)
DSCAL
subroutine sscal (n, sa, sx, incx)
SSCAL
subroutine zdscal (n, da, zx, incx)
ZDSCAL
subroutine zscal (n, za, zx, incx)
ZSCAL

## Function Documentation

### subroutine cscal (integer n, complex ca, complex, dimension(*) cx, integer incx)

CSCAL

Purpose:

`    CSCAL scales a vector by a constant.`
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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, linpack,  3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 77 of file cscal.f.

### subroutine csscal (integer n, real sa, complex, dimension(*) cx, integer incx)

CSSCAL

Purpose:

`    CSSCAL scales a complex vector by a real constant.`
Parameters

N

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

SA

```          SA is REAL
On entry, SA 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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, linpack, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 77 of file csscal.f.

### subroutine dscal (integer n, double precision da, double precision, dimension(*) dx, integer incx)

DSCAL

Purpose:

```    DSCAL scales a vector by a constant.
uses unrolled loops for increment equal to 1.```
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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, linpack, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 78 of file dscal.f.

### subroutine sscal (integer n, real sa, real, dimension(*) sx, integer incx)

SSCAL

Purpose:

```    SSCAL scales a vector by a constant.
uses unrolled loops for increment equal to 1.```
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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, linpack, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 78 of file sscal.f.

### subroutine zdscal (integer n, double precision da, complex*16, dimension(*) zx, integer incx)

ZDSCAL

Purpose:

`    ZDSCAL scales a vector by a constant.`
Parameters

N

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

DA

```          DA is DOUBLE PRECISION
On entry, DA 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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 77 of file zdscal.f.

### subroutine zscal (integer n, complex*16 za, complex*16, dimension(*) zx, integer incx)

ZSCAL

Purpose:

`    ZSCAL scales a vector by a constant.`
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```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Further Details:

```     jack dongarra, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 77 of file zscal.f.

## Author

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## Info

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