# rscl - Man Page

rscl: scale vector by reciprocal

## Synopsis

### Functions

subroutine **csrscl** (n, sa, sx, incx)**CSRSCL** multiplies a vector by the reciprocal of a real scalar.

subroutine **drscl** (n, sa, sx, incx)**DRSCL** multiplies a vector by the reciprocal of a real scalar.

subroutine **srscl** (n, sa, sx, incx)**SRSCL** multiplies a vector by the reciprocal of a real scalar.

subroutine **zdrscl** (n, sa, sx, incx)**ZDRSCL** multiplies a vector by the reciprocal of a real scalar.

## Detailed Description

## Function Documentation

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

**CSRSCL** multiplies a vector by the reciprocal of a real scalar.

**Purpose:**

CSRSCL multiplies an n-element complex vector x by the real scalar 1/a. This is done without overflow or underflow as long as the final result x/a does not overflow or underflow.

**Parameters***N*N is INTEGER The number of components of the vector x.

*SA*SA is REAL The scalar a which is used to divide each component of x. SA must be >= 0, or the subroutine will divide by zero.

*SX*SX is COMPLEX array, dimension (1+(N-1)*abs(INCX)) The n-element vector x.

*INCX*INCX is INTEGER The increment between successive values of the vector SX. > 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **83** of file **csrscl.f**.

### subroutine drscl (integer n, double precision sa, double precision, dimension( * ) sx, integer incx)

**DRSCL** multiplies a vector by the reciprocal of a real scalar.

**Purpose:**

DRSCL multiplies an n-element real vector x by the real scalar 1/a. This is done without overflow or underflow as long as the final result x/a does not overflow or underflow.

**Parameters***N*N is INTEGER The number of components of the vector x.

*SA*SA is DOUBLE PRECISION The scalar a which is used to divide each component of x. SA must be >= 0, or the subroutine will divide by zero.

*SX*SX is DOUBLE PRECISION array, dimension (1+(N-1)*abs(INCX)) The n-element vector x.

*INCX*INCX is INTEGER The increment between successive values of the vector SX. > 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **83** of file **drscl.f**.

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

**SRSCL** multiplies a vector by the reciprocal of a real scalar.

**Purpose:**

SRSCL multiplies an n-element real vector x by the real scalar 1/a. This is done without overflow or underflow as long as the final result x/a does not overflow or underflow.

**Parameters***N*N is INTEGER The number of components of the vector x.

*SA*SA is REAL The scalar a which is used to divide each component of x. SA must be >= 0, or the subroutine will divide by zero.

*SX*SX is REAL array, dimension (1+(N-1)*abs(INCX)) The n-element vector x.

*INCX*INCX is INTEGER The increment between successive values of the vector SX. > 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **83** of file **srscl.f**.

### subroutine zdrscl (integer n, double precision sa, complex*16, dimension( * ) sx, integer incx)

**ZDRSCL** multiplies a vector by the reciprocal of a real scalar.

**Purpose:**

ZDRSCL multiplies an n-element complex vector x by the real scalar 1/a. This is done without overflow or underflow as long as the final result x/a does not overflow or underflow.

**Parameters***N*N is INTEGER The number of components of the vector x.

*SA*SA is DOUBLE PRECISION The scalar a which is used to divide each component of x. SA must be >= 0, or the subroutine will divide by zero.

*SX*SX is COMPLEX*16 array, dimension (1+(N-1)*abs(INCX)) The n-element vector x.

*INCX***Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **83** of file **zdrscl.f**.

## Author

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