Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     zdscal - Compute y := alpha * y

SYNOPSIS

     SUBROUTINE ZDSCAL(N, ALPHA, Y, INCY)

     DOUBLE COMPLEX Y(*)
     INTEGER N, INCY
     DOUBLE PRECISION ALPHA

     SUBROUTINE ZDSCAL_64(N, ALPHA, Y, INCY)

     DOUBLE COMPLEX Y(*)
     INTEGER*8 N, INCY
     DOUBLE PRECISION ALPHA

  F95 INTERFACE
     SUBROUTINE SCAL([N], ALPHA, Y, [INCY])

     COMPLEX(8), DIMENSION(:) :: Y
     INTEGER :: N, INCY
     REAL(8) :: ALPHA

     SUBROUTINE SCAL_64([N], ALPHA, Y, [INCY])

     COMPLEX(8), DIMENSION(:) :: Y
     INTEGER(8) :: N, INCY
     REAL(8) :: ALPHA

  C INTERFACE
     #include <sunperf.h>

     void zdscal(int  n,  double  alpha,  doublecomplex  *y,  int
               incy);

     void zdscal_64(long n, double alpha, doublecomplex *y,  long
               incy);

PURPOSE

     zdscal Compute y := alpha * y where alpha is a scalar and  y
     is an n-vector.

ARGUMENTS

     N (input)
               On entry, N specifies the number  of  elements  in
               the  vector.   N must be at least one for the sub-
               routine to have any visible effect.  Unchanged  on
               exit.

     ALPHA (input)
               On  entry,  ALPHA  specifies  the  scalar   alpha.
               Unchanged on exit.

     Y (input/output)
               ( 1 + ( n - 1 )*INCY ).  On entry, the incremented
               array  Y  must contain the vector y. On exit, Y is
               overwritten by the updated vector y.

     INCY (input)
               On entry, INCY specifies  the  increment  for  the
               elements of Y. This routine returns immediately if
               INCY is less than or equal to zero.  Unchanged  on
               exit.