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
Item | Description |
---|---|
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.