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rscl(3) LAPACK rscl(3)

NAME

rscl - 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.

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.

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.

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

!>          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.

Author

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Tue Jun 30 2026 04:57:07 Version 3.12.0