SSCAL, DSCAL, CSSCAL, CSCAL, ZDSCAL, or ZSCAL Subroutine

Base Operating System and Extensions Technical Reference, Volume 2

Scales a vector by a constant.

BLAS Library (libblas.a)

SUBROUTINE SSCAL(N,A,X,INCX)
INTEGER INCX,N
REAL A
REAL X(*)

SUBROUTINE DSCAL(N,A,X,INCX)
INTEGER INCX,N
DOUBLE PRECISION A
DOUBLE PRECISION X(*)

SUBROUTINE CSSCAL(N,A,X,INCX)
INTEGER INCX,N
REAL A
COMPLEX X(*)

SUBROUTINE CSCAL
INTEGER INCX,N
COMPLEX A
COMPLEX X(*)

SUBROUTINE ZDSCAL
INTEGER INCX,N
DOUBLE PRECISION A
COMPLEX*16 X(*)

SUBROUTINE ZSCAL(
INTEGER INCX,N
COMPLEX*16 A
COMPLEX*16 X(*)

The SSCAL, DSCAL, CSSCAL, CSCAL, ZDSCAL, or ZSCAL subroutine scales a vector by a constant:

X := X * A

N	On entry, N specifies the number of elements in X and Y; unchanged on exit.
A	Scaling constant; unchanged on exit.
X	Vector of dimension at least (1 + (N-1) * abs(INCX) ); on exit, contains the scaled vector.
INCX	On entry, INCX specifies the increment for the elements of X; INCX must be greater than 0; unchanged on exit.

For values of N <= 0, the subroutines return immediately.